diff --git a/.eslintrc.changed.js b/.eslintrc.changed.js
index a1c2c452273e..55472b10ea86 100644
--- a/.eslintrc.changed.js
+++ b/.eslintrc.changed.js
@@ -11,15 +11,14 @@ module.exports = {
     overrides: [
         {
             files: [
-                'src/libs/ReportUtils.ts',
                 'src/libs/actions/IOU.ts',
                 'src/libs/actions/Report.ts',
                 'src/libs/actions/Task.ts',
                 'src/libs/OptionsListUtils.ts',
-                'src/libs/ReportActionsUtils.ts',
                 'src/libs/TransactionUtils/index.ts',
                 'src/pages/home/ReportScreen.tsx',
                 'src/pages/workspace/WorkspaceInitialPage.tsx',
+                'src/pages/home/report/PureReportActionItem.tsx',
             ],
             rules: {
                 'rulesdir/no-default-id-values': 'off',
diff --git a/src/libs/OptionsListUtils.ts b/src/libs/OptionsListUtils.ts
index b588b3dd5359..38e4c5776e3e 100644
--- a/src/libs/OptionsListUtils.ts
+++ b/src/libs/OptionsListUtils.ts
@@ -1300,7 +1300,7 @@ function getValidOptions(
 
                 if (reportPreviewAction) {
                     const iouReportID = ReportActionUtils.getIOUReportIDFromReportActionPreview(reportPreviewAction);
-                    const iouReportActions = allSortedReportActions[iouReportID] ?? [];
+                    const iouReportActions = iouReportID ? allSortedReportActions[iouReportID] ?? [] : [];
                     const lastIOUAction = iouReportActions.find((iouAction) => iouAction.actionName === CONST.REPORT.ACTIONS.TYPE.IOU);
                     if (lastIOUAction) {
                         reportOption.lastIOUCreationDate = lastIOUAction.lastModified;
diff --git a/src/libs/PolicyUtils.ts b/src/libs/PolicyUtils.ts
index 91381a0b0119..8fa1171aea1e 100644
--- a/src/libs/PolicyUtils.ts
+++ b/src/libs/PolicyUtils.ts
@@ -257,7 +257,7 @@ const isPolicyEmployee = (policyID: string | undefined, policies: OnyxCollection
 /**
  * Checks if the current user is an owner (creator) of the policy.
  */
-const isPolicyOwner = (policy: OnyxInputOrEntry<Policy>, currentUserAccountID: number): boolean => policy?.ownerAccountID === currentUserAccountID;
+const isPolicyOwner = (policy: OnyxInputOrEntry<Policy>, currentUserAccountID: number | undefined): boolean => !!currentUserAccountID && policy?.ownerAccountID === currentUserAccountID;
 
 /**
  * Create an object mapping member emails to their accountIDs. Filter for members without errors if includeMemberWithErrors is false, and get the login email from the personalDetail object using the accountID.
@@ -420,7 +420,7 @@ function isTaxTrackingEnabled(isPolicyExpenseChat: boolean, policy: OnyxEntry<Po
     const distanceUnit = getDistanceRateCustomUnit(policy);
     const customUnitID = distanceUnit?.customUnitID ?? CONST.DEFAULT_NUMBER_ID;
     const isPolicyTaxTrackingEnabled = isPolicyExpenseChat && policy?.tax?.trackingEnabled;
-    const isTaxEnabledForDistance = isPolicyTaxTrackingEnabled && policy?.customUnits?.[customUnitID]?.attributes?.taxEnabled;
+    const isTaxEnabledForDistance = isPolicyTaxTrackingEnabled && !!customUnitID && policy?.customUnits?.[customUnitID]?.attributes?.taxEnabled;
 
     return !!(isDistanceRequest ? isTaxEnabledForDistance : isPolicyTaxTrackingEnabled);
 }
diff --git a/src/libs/ReportActionsUtils.ts b/src/libs/ReportActionsUtils.ts
index 4fa704944bc9..c1f4057199ee 100644
--- a/src/libs/ReportActionsUtils.ts
+++ b/src/libs/ReportActionsUtils.ts
@@ -286,7 +286,7 @@ function isWhisperActionTargetedToOthers(reportAction: OnyxInputOrEntry<ReportAc
     if (!isWhisperAction(reportAction)) {
         return false;
     }
-    return !getWhisperedTo(reportAction).includes(currentUserAccountID ?? -1);
+    return !getWhisperedTo(reportAction).includes(currentUserAccountID ?? CONST.DEFAULT_NUMBER_ID);
 }
 
 function isReimbursementQueuedAction(reportAction: OnyxInputOrEntry<ReportAction>): reportAction is ReportAction<typeof CONST.REPORT.ACTIONS.TYPE.REIMBURSEMENT_QUEUED> {
@@ -347,7 +347,7 @@ function isInviteOrRemovedAction(
 /**
  * Returns whether the comment is a thread parent message/the first message in a thread
  */
-function isThreadParentMessage(reportAction: OnyxEntry<ReportAction>, reportID: string): boolean {
+function isThreadParentMessage(reportAction: OnyxEntry<ReportAction>, reportID: string | undefined): boolean {
     const {childType, childVisibleActionCount = 0, childReportID} = reportAction ?? {};
     return childType === CONST.REPORT.TYPE.CHAT && (childVisibleActionCount > 0 || String(childReportID) === reportID);
 }
@@ -771,7 +771,11 @@ function replaceBaseURLInPolicyChangeLogAction(reportAction: ReportAction): Repo
     return updatedReportAction;
 }
 
-function getLastVisibleAction(reportID: string, canUserPerformWriteAction?: boolean, actionsToMerge: Record<string, NullishDeep<ReportAction> | null> = {}): OnyxEntry<ReportAction> {
+function getLastVisibleAction(
+    reportID: string | undefined,
+    canUserPerformWriteAction?: boolean,
+    actionsToMerge: Record<string, NullishDeep<ReportAction> | null> = {},
+): OnyxEntry<ReportAction> {
     let reportActions: Array<ReportAction | null | undefined> = [];
     if (!isEmpty(actionsToMerge)) {
         reportActions = Object.values(fastMerge(allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${reportID}`] ?? {}, actionsToMerge ?? {}, true)) as Array<
@@ -801,7 +805,7 @@ function formatLastMessageText(lastMessageText: string) {
 }
 
 function getLastVisibleMessage(
-    reportID: string,
+    reportID: string | undefined,
     canUserPerformWriteAction?: boolean,
     actionsToMerge: Record<string, NullishDeep<ReportAction> | null> = {},
     reportAction: OnyxInputOrEntry<ReportAction> | undefined = undefined,
@@ -893,12 +897,12 @@ function getLastClosedReportAction(reportActions: OnyxEntry<ReportActions>): Ony
  * 4. We will get the second last action from filtered actions because the last
  *    action is always the created action
  */
-function getFirstVisibleReportActionID(sortedReportActions: ReportAction[] = [], isOffline = false): string {
+function getFirstVisibleReportActionID(sortedReportActions: ReportAction[] = [], isOffline = false): string | undefined {
     if (!Array.isArray(sortedReportActions)) {
         return '';
     }
     const sortedFilterReportActions = sortedReportActions.filter((action) => !isDeletedAction(action) || (action?.childVisibleActionCount ?? 0) > 0 || isOffline);
-    return sortedFilterReportActions.length > 1 ? sortedFilterReportActions.at(sortedFilterReportActions.length - 2)?.reportActionID ?? '-1' : '';
+    return sortedFilterReportActions.length > 1 ? sortedFilterReportActions.at(sortedFilterReportActions.length - 2)?.reportActionID : undefined;
 }
 
 /**
@@ -991,8 +995,8 @@ function getReportPreviewAction(chatReportID: string | undefined, iouReportID: s
 /**
  * Get the iouReportID for a given report action.
  */
-function getIOUReportIDFromReportActionPreview(reportAction: OnyxEntry<ReportAction>): string {
-    return isActionOfType(reportAction, CONST.REPORT.ACTIONS.TYPE.REPORT_PREVIEW) ? getOriginalMessage(reportAction)?.linkedReportID ?? '-1' : '-1';
+function getIOUReportIDFromReportActionPreview(reportAction: OnyxEntry<ReportAction>): string | undefined {
+    return isActionOfType(reportAction, CONST.REPORT.ACTIONS.TYPE.REPORT_PREVIEW) ? getOriginalMessage(reportAction)?.linkedReportID : undefined;
 }
 
 /**
@@ -1057,7 +1061,11 @@ const iouRequestTypes = new Set<ValueOf<typeof CONST.IOU.REPORT_ACTION_TYPE>>([
  * Gets the reportID for the transaction thread associated with a report by iterating over the reportActions and identifying the IOU report actions.
  * Returns a reportID if there is exactly one transaction thread for the report, and null otherwise.
  */
-function getOneTransactionThreadReportID(reportID: string, reportActions: OnyxEntry<ReportActions> | ReportAction[], isOffline: boolean | undefined = undefined): string | undefined {
+function getOneTransactionThreadReportID(
+    reportID: string | undefined,
+    reportActions: OnyxEntry<ReportActions> | ReportAction[],
+    isOffline: boolean | undefined = undefined,
+): string | undefined {
     // If the report is not an IOU, Expense report, or Invoice, it shouldn't be treated as one-transaction report.
     const report = allReports?.[`${ONYXKEYS.COLLECTION.REPORT}${reportID}`];
     if (report?.type !== CONST.REPORT.TYPE.IOU && report?.type !== CONST.REPORT.TYPE.EXPENSE && report?.type !== CONST.REPORT.TYPE.INVOICE) {
@@ -1126,7 +1134,7 @@ function doesReportHaveVisibleActions(reportID: string, canUserPerformWriteActio
     return visibleReportActionsWithoutTaskSystemMessage.length > 0;
 }
 
-function getAllReportActions(reportID: string): ReportActions {
+function getAllReportActions(reportID: string | undefined): ReportActions {
     return allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${reportID}`] ?? {};
 }
 
@@ -1500,7 +1508,7 @@ function isReportActionUnread(reportAction: OnyxEntry<ReportAction>, lastReadTim
  */
 function isCurrentActionUnread(report: OnyxEntry<Report>, reportAction: ReportAction): boolean {
     const lastReadTime = report?.lastReadTime ?? '';
-    const sortedReportActions = getSortedReportActions(Object.values(getAllReportActions(report?.reportID ?? '-1')));
+    const sortedReportActions = getSortedReportActions(Object.values(getAllReportActions(report?.reportID)));
     const currentActionIndex = sortedReportActions.findIndex((action) => action.reportActionID === reportAction.reportActionID);
     if (currentActionIndex === -1) {
         return false;
@@ -1560,7 +1568,8 @@ function getDismissedViolationMessageText(originalMessage: ReportAction<typeof C
  * Check if the linked transaction is on hold
  */
 function isLinkedTransactionHeld(reportActionID: string, reportID: string): boolean {
-    return TransactionUtils.isOnHoldByTransactionID(getLinkedTransactionID(reportActionID, reportID) ?? '-1');
+    const linkedTransactionID = getLinkedTransactionID(reportActionID, reportID);
+    return linkedTransactionID ? TransactionUtils.isOnHoldByTransactionID(linkedTransactionID) : false;
 }
 
 function getMentionedAccountIDsFromAction(reportAction: OnyxInputOrEntry<ReportAction>) {
@@ -1577,7 +1586,7 @@ function didMessageMentionCurrentUser(reportAction: OnyxInputOrEntry<ReportActio
     const accountIDsFromMessage = getMentionedAccountIDsFromAction(reportAction);
     const message = getReportActionMessage(reportAction)?.html ?? '';
     const emailsFromMessage = getMentionedEmailsFromMessage(message);
-    return accountIDsFromMessage.includes(currentUserAccountID ?? -1) || emailsFromMessage.includes(currentEmail) || message.includes('<mention-here>');
+    return accountIDsFromMessage.includes(currentUserAccountID ?? CONST.DEFAULT_NUMBER_ID) || emailsFromMessage.includes(currentEmail) || message.includes('<mention-here>');
 }
 
 /**
@@ -1592,9 +1601,9 @@ function wasActionTakenByCurrentUser(reportAction: OnyxInputOrEntry<ReportAction
  */
 function getIOUActionForReportID(reportID: string, transactionID: string): OnyxEntry<ReportAction> {
     const report = allReports?.[`${ONYXKEYS.COLLECTION.REPORT}${reportID}`];
-    const reportActions = getAllReportActions(report?.reportID ?? '');
+    const reportActions = getAllReportActions(report?.reportID);
     const action = Object.values(reportActions ?? {})?.find((reportAction) => {
-        const IOUTransactionID = isMoneyRequestAction(reportAction) ? getOriginalMessage(reportAction)?.IOUTransactionID : -1;
+        const IOUTransactionID = isMoneyRequestAction(reportAction) ? getOriginalMessage(reportAction)?.IOUTransactionID : undefined;
         return IOUTransactionID === transactionID;
     });
     return action;
@@ -1641,7 +1650,7 @@ function getExportIntegrationActionFragments(reportAction: OnyxEntry<ReportActio
     const {label, markedManually} = originalMessage;
     const reimbursableUrls = originalMessage.reimbursableUrls ?? [];
     const nonReimbursableUrls = originalMessage.nonReimbursableUrls ?? [];
-    const reportID = reportAction?.reportID ?? '';
+    const reportID = reportAction?.reportID;
     const wasExportedAfterBase62 = (reportAction?.created ?? '') > '2022-11-14';
     const base62ReportID = getBase62ReportID(Number(reportID));
 
@@ -1775,7 +1784,7 @@ function getRenamedAction(reportAction: OnyxEntry<ReportAction<typeof CONST.REPO
 
 function getRemovedFromApprovalChainMessage(reportAction: OnyxEntry<ReportAction<typeof CONST.REPORT.ACTIONS.TYPE.REMOVED_FROM_APPROVAL_CHAIN>>) {
     const originalMessage = getOriginalMessage(reportAction);
-    const submittersNames = PersonalDetailsUtils.getPersonalDetailsByIDs(originalMessage?.submittersAccountIDs ?? [], currentUserAccountID ?? -1).map(
+    const submittersNames = PersonalDetailsUtils.getPersonalDetailsByIDs(originalMessage?.submittersAccountIDs ?? [], currentUserAccountID ?? CONST.DEFAULT_NUMBER_ID).map(
         ({displayName, login}) => displayName ?? login ?? 'Unknown Submitter',
     );
     return Localize.translateLocal('workspaceActions.removedFromApprovalWorkflow', {submittersNames, count: submittersNames.length});
@@ -1802,9 +1811,9 @@ function getCardIssuedMessage(reportAction: OnyxEntry<ReportAction>, shouldRende
         ? getOriginalMessage(reportAction)
         : undefined;
 
-    const assigneeAccountID = cardIssuedActionOriginalMessage?.assigneeAccountID ?? -1;
-    const cardID = cardIssuedActionOriginalMessage?.cardID ?? -1;
-    const assigneeDetails = PersonalDetailsUtils.getPersonalDetailsByIDs([assigneeAccountID], currentUserAccountID ?? -1).at(0);
+    const assigneeAccountID = cardIssuedActionOriginalMessage?.assigneeAccountID ?? CONST.DEFAULT_NUMBER_ID;
+    const cardID = cardIssuedActionOriginalMessage?.cardID ?? CONST.DEFAULT_NUMBER_ID;
+    const assigneeDetails = PersonalDetailsUtils.getPersonalDetailsByIDs([assigneeAccountID], currentUserAccountID ?? CONST.DEFAULT_NUMBER_ID).at(0);
     const isPolicyAdmin = PolicyUtils.isPolicyAdmin(PolicyUtils.getPolicy(policyID));
     const assignee = shouldRenderHTML ? `<mention-user accountID="${assigneeAccountID}"/>` : assigneeDetails?.firstName ?? assigneeDetails?.login ?? '';
     const navigateRoute = isPolicyAdmin ? ROUTES.EXPENSIFY_CARD_DETAILS.getRoute(policyID, String(cardID)) : ROUTES.SETTINGS_DOMAINCARD_DETAIL.getRoute(String(cardID));
diff --git a/src/libs/ReportUtils.ts b/src/libs/ReportUtils.ts
index 589c5f1a6adc..4b7aaa62cdbf 100644
--- a/src/libs/ReportUtils.ts
+++ b/src/libs/ReportUtils.ts
@@ -1,7 +1,6 @@
 import {format} from 'date-fns';
 import {Str} from 'expensify-common';
 import lodashEscape from 'lodash/escape';
-import lodashFindLastIndex from 'lodash/findLastIndex';
 import lodashIntersection from 'lodash/intersection';
 import isEmpty from 'lodash/isEmpty';
 import lodashIsEqual from 'lodash/isEqual';
@@ -612,7 +611,9 @@ let currentUserPersonalDetails: OnyxEntry<PersonalDetails>;
 Onyx.connect({
     key: ONYXKEYS.PERSONAL_DETAILS_LIST,
     callback: (value) => {
-        currentUserPersonalDetails = value?.[currentUserAccountID ?? -1] ?? undefined;
+        if (currentUserAccountID) {
+            currentUserPersonalDetails = value?.[currentUserAccountID] ?? undefined;
+        }
         allPersonalDetails = value ?? {};
         allPersonalDetailLogins = Object.values(allPersonalDetails).map((personalDetail) => personalDetail?.login ?? '');
     },
@@ -787,6 +788,14 @@ function getReportOrDraftReport(reportID: string | undefined): OnyxEntry<Report>
     return allReports?.[`${ONYXKEYS.COLLECTION.REPORT}${reportID}`] ?? allReportsDraft?.[`${ONYXKEYS.COLLECTION.REPORT_DRAFT}${reportID}`];
 }
 
+function getReportTransactions(reportID: string | undefined): Transaction[] {
+    if (!reportID) {
+        return [];
+    }
+
+    return reportsTransactions[reportID] ?? [];
+}
+
 /**
  * Check if a report is a draft report
  */
@@ -799,7 +808,7 @@ function isDraftReport(reportID: string | undefined): boolean {
 /**
  * Returns the report
  */
-function getReport(reportID: string): OnyxEntry<Report> {
+function getReport(reportID: string | undefined): OnyxEntry<Report> {
     return allReports?.[`${ONYXKEYS.COLLECTION.REPORT}${reportID}`];
 }
 
@@ -807,7 +816,7 @@ function getReport(reportID: string): OnyxEntry<Report> {
  * Returns the report
  */
 function getReportNameValuePairs(reportID?: string): OnyxEntry<ReportNameValuePairs> {
-    return allReportNameValuePair?.[`${ONYXKEYS.COLLECTION.REPORT_NAME_VALUE_PAIRS}${reportID ?? -1}`];
+    return allReportNameValuePair?.[`${ONYXKEYS.COLLECTION.REPORT_NAME_VALUE_PAIRS}${reportID}`];
 }
 
 /**
@@ -1051,8 +1060,8 @@ function isSettled(reportOrID: OnyxInputOrEntry<Report> | SearchReport | string
 /**
  * Whether the current user is the submitter of the report
  */
-function isCurrentUserSubmitter(reportID: string): boolean {
-    if (!allReports) {
+function isCurrentUserSubmitter(reportID: string | undefined): boolean {
+    if (!allReports || !reportID) {
         return false;
     }
     const report = allReports[`${ONYXKEYS.COLLECTION.REPORT}${reportID}`];
@@ -1308,7 +1317,8 @@ function getDefaultNotificationPreferenceForReport(report: OnyxEntry<Report>): V
  * Get the notification preference given a report. This should ALWAYS default to 'hidden'. Do not change this!
  */
 function getReportNotificationPreference(report: OnyxEntry<Report>): ValueOf<typeof CONST.REPORT.NOTIFICATION_PREFERENCE> {
-    return report?.participants?.[currentUserAccountID ?? -1]?.notificationPreference ?? CONST.REPORT.NOTIFICATION_PREFERENCE.HIDDEN;
+    const participant = currentUserAccountID ? report?.participants?.[currentUserAccountID] : undefined;
+    return participant?.notificationPreference ?? CONST.REPORT.NOTIFICATION_PREFERENCE.HIDDEN;
 }
 
 const CONCIERGE_ACCOUNT_ID_STRING = CONST.ACCOUNT_ID.CONCIERGE.toString();
@@ -1643,7 +1653,11 @@ function isPolicyExpenseChatAdmin(report: OnyxEntry<Report>, policies: OnyxColle
 /**
  * Checks if the current user is the admin of the policy.
  */
-function isPolicyAdmin(policyID: string, policies: OnyxCollection<Policy>): boolean {
+function isPolicyAdmin(policyID: string | undefined, policies: OnyxCollection<Policy>): boolean {
+    if (!policyID) {
+        return false;
+    }
+
     const policyRole = policies?.[`${ONYXKEYS.COLLECTION.POLICY}${policyID}`]?.role;
 
     return policyRole === CONST.POLICY.ROLE.ADMIN;
@@ -1653,7 +1667,7 @@ function isPolicyAdmin(policyID: string, policies: OnyxCollection<Policy>): bool
  * Checks whether all the transactions linked to the IOU report are of the Distance Request type with pending routes
  */
 function hasOnlyTransactionsWithPendingRoutes(iouReportID: string | undefined): boolean {
-    const transactions = reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactions = getReportTransactions(iouReportID);
 
     // Early return false in case not having any transaction
     if (!transactions || transactions.length === 0) {
@@ -1737,11 +1751,7 @@ function isMoneyRequestReport(reportOrID: OnyxInputOrEntry<Report> | SearchRepor
  * Checks if a report contains only Non-Reimbursable transactions
  */
 function hasOnlyNonReimbursableTransactions(iouReportID: string | undefined): boolean {
-    if (!iouReportID) {
-        return false;
-    }
-
-    const transactions = reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactions = getReportTransactions(iouReportID);
     if (!transactions || transactions.length === 0) {
         return false;
     }
@@ -1752,7 +1762,7 @@ function hasOnlyNonReimbursableTransactions(iouReportID: string | undefined): bo
 /**
  * Checks if a report has only one transaction associated with it
  */
-function isOneTransactionReport(reportID: string): boolean {
+function isOneTransactionReport(reportID: string | undefined): boolean {
     const reportActions = allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${reportID}`] ?? ([] as ReportAction[]);
     return ReportActionsUtils.getOneTransactionThreadReportID(reportID, reportActions) !== null;
 }
@@ -1786,9 +1796,9 @@ function isOneTransactionThread(reportID: string | undefined, parentReportID: st
  */
 function getDisplayedReportID(reportID: string): string {
     const report = getReport(reportID);
-    const parentReportID = report?.parentReportID ?? '';
-    const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, report?.parentReportActionID ?? '');
-    return isOneTransactionThread(reportID, parentReportID, parentReportAction) ? parentReportID : reportID;
+    const parentReportID = report?.parentReportID;
+    const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, report?.parentReportActionID);
+    return parentReportID && isOneTransactionThread(reportID, parentReportID, parentReportAction) ? parentReportID : reportID;
 }
 
 /**
@@ -1797,7 +1807,8 @@ function getDisplayedReportID(reportID: string): string {
  */
 function isOneOnOneChat(report: OnyxEntry<Report>): boolean {
     const participants = report?.participants ?? {};
-    const isCurrentUserParticipant = participants[currentUserAccountID ?? 0] ? 1 : 0;
+    const participant = currentUserAccountID ? participants[currentUserAccountID] : undefined;
+    const isCurrentUserParticipant = participant ? 1 : 0;
     const participantAmount = Object.keys(participants).length - isCurrentUserParticipant;
     if (participantAmount !== 1) {
         return false;
@@ -2381,6 +2392,8 @@ function getIcons(
     policy?: OnyxInputOrEntry<Policy>,
     invoiceReceiverPolicy?: OnyxInputOrEntry<Policy>,
 ): Icon[] {
+    const ownerDetails = report?.ownerAccountID ? personalDetails?.[report.ownerAccountID] : undefined;
+
     if (isEmptyObject(report)) {
         const fallbackIcon: Icon = {
             source: defaultIcon ?? FallbackAvatar,
@@ -2393,12 +2406,13 @@ function getIcons(
     if (isExpenseRequest(report)) {
         const parentReportAction = allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${report.parentReportID}`]?.[report.parentReportActionID];
         const workspaceIcon = getWorkspaceIcon(report, policy);
+        const actorDetails = parentReportAction?.actorAccountID ? personalDetails?.[parentReportAction.actorAccountID] : undefined;
         const memberIcon = {
-            source: personalDetails?.[parentReportAction?.actorAccountID ?? -1]?.avatar ?? FallbackAvatar,
+            source: actorDetails?.avatar ?? FallbackAvatar,
             id: parentReportAction?.actorAccountID,
             type: CONST.ICON_TYPE_AVATAR,
-            name: personalDetails?.[parentReportAction?.actorAccountID ?? -1]?.displayName ?? '',
-            fallbackIcon: personalDetails?.[parentReportAction?.actorAccountID ?? -1]?.fallbackIcon,
+            name: actorDetails?.displayName ?? '',
+            fallbackIcon: actorDetails?.fallbackIcon,
         };
 
         return [memberIcon, workspaceIcon];
@@ -2407,13 +2421,14 @@ function getIcons(
         const parentReportAction = allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${report.parentReportID}`]?.[report.parentReportActionID];
 
         const actorAccountID = getReportActionActorAccountID(parentReportAction, report, report);
-        const actorDisplayName = PersonalDetailsUtils.getDisplayNameOrDefault(allPersonalDetails?.[actorAccountID ?? -1], '', false);
+        const actorDetails = actorAccountID ? personalDetails?.[actorAccountID] : undefined;
+        const actorDisplayName = PersonalDetailsUtils.getDisplayNameOrDefault(actorDetails, '', false);
         const actorIcon = {
             id: actorAccountID,
-            source: personalDetails?.[actorAccountID ?? -1]?.avatar ?? FallbackAvatar,
+            source: actorDetails?.avatar ?? FallbackAvatar,
             name: LocalePhoneNumber.formatPhoneNumber(actorDisplayName),
             type: CONST.ICON_TYPE_AVATAR,
-            fallbackIcon: personalDetails?.[parentReportAction?.actorAccountID ?? -1]?.fallbackIcon,
+            fallbackIcon: actorDetails?.fallbackIcon,
         };
 
         if (isWorkspaceThread(report)) {
@@ -2425,10 +2440,10 @@ function getIcons(
     if (isTaskReport(report)) {
         const ownerIcon = {
             id: report?.ownerAccountID,
-            source: personalDetails?.[report?.ownerAccountID ?? -1]?.avatar ?? FallbackAvatar,
+            source: ownerDetails?.avatar ?? FallbackAvatar,
             type: CONST.ICON_TYPE_AVATAR,
-            name: personalDetails?.[report?.ownerAccountID ?? -1]?.displayName ?? '',
-            fallbackIcon: personalDetails?.[report?.ownerAccountID ?? -1]?.fallbackIcon,
+            name: ownerDetails?.displayName ?? '',
+            fallbackIcon: ownerDetails?.fallbackIcon,
         };
 
         if (isWorkspaceTaskReport(report)) {
@@ -2475,33 +2490,34 @@ function getIcons(
     if (isPolicyExpenseChat(report) || isExpenseReport(report)) {
         const workspaceIcon = getWorkspaceIcon(report, policy);
         const memberIcon = {
-            source: personalDetails?.[report?.ownerAccountID ?? -1]?.avatar ?? FallbackAvatar,
+            source: ownerDetails?.avatar ?? FallbackAvatar,
             id: report?.ownerAccountID,
             type: CONST.ICON_TYPE_AVATAR,
-            name: personalDetails?.[report?.ownerAccountID ?? -1]?.displayName ?? '',
-            fallbackIcon: personalDetails?.[report?.ownerAccountID ?? -1]?.fallbackIcon,
+            name: ownerDetails?.displayName ?? '',
+            fallbackIcon: ownerDetails?.fallbackIcon,
         };
         return isExpenseReport(report) ? [memberIcon, workspaceIcon] : [workspaceIcon, memberIcon];
     }
     if (isIOUReport(report)) {
+        const managerDetails = report?.managerID ? personalDetails?.[report.managerID] : undefined;
         const managerIcon = {
-            source: personalDetails?.[report?.managerID ?? -1]?.avatar ?? FallbackAvatar,
+            source: managerDetails?.avatar ?? FallbackAvatar,
             id: report?.managerID,
             type: CONST.ICON_TYPE_AVATAR,
-            name: personalDetails?.[report?.managerID ?? -1]?.displayName ?? '',
-            fallbackIcon: personalDetails?.[report?.managerID ?? -1]?.fallbackIcon,
+            name: managerDetails?.displayName ?? '',
+            fallbackIcon: managerDetails?.fallbackIcon,
         };
         const ownerIcon = {
             id: report?.ownerAccountID,
-            source: personalDetails?.[report?.ownerAccountID ?? -1]?.avatar ?? FallbackAvatar,
+            source: ownerDetails?.avatar ?? FallbackAvatar,
             type: CONST.ICON_TYPE_AVATAR,
-            name: personalDetails?.[report?.ownerAccountID ?? -1]?.displayName ?? '',
-            fallbackIcon: personalDetails?.[report?.ownerAccountID ?? -1]?.fallbackIcon,
+            name: ownerDetails?.displayName ?? '',
+            fallbackIcon: ownerDetails?.fallbackIcon,
         };
         const isManager = currentUserAccountID === report?.managerID;
 
         // For one transaction IOUs, display a simplified report icon
-        if (isOneTransactionReport(report?.reportID ?? '-1')) {
+        if (isOneTransactionReport(report?.reportID)) {
             return [ownerIcon];
         }
 
@@ -2509,7 +2525,7 @@ function getIcons(
     }
 
     if (isSelfDM(report)) {
-        return getIconsForParticipants([currentUserAccountID ?? -1], personalDetails);
+        return getIconsForParticipants(currentUserAccountID ? [currentUserAccountID] : [], personalDetails);
     }
 
     if (isSystemChat(report)) {
@@ -2767,7 +2783,7 @@ function buildOptimisticCancelPaymentReportAction(expenseReportID: string, amoun
  */
 function getLastVisibleMessage(reportID: string | undefined, actionsToMerge: ReportActions = {}): LastVisibleMessage {
     const report = getReportOrDraftReport(reportID);
-    const lastVisibleAction = ReportActionsUtils.getLastVisibleAction(reportID ?? '-1', canUserPerformWriteAction(report), actionsToMerge);
+    const lastVisibleAction = ReportActionsUtils.getLastVisibleAction(reportID, canUserPerformWriteAction(report), actionsToMerge);
 
     // For Chat Report with deleted parent actions, let us fetch the correct message
     if (ReportActionsUtils.isDeletedParentAction(lastVisibleAction) && !isEmptyObject(report) && isChatReport(report)) {
@@ -2778,7 +2794,7 @@ function getLastVisibleMessage(reportID: string | undefined, actionsToMerge: Rep
     }
 
     // Fetch the last visible message for report represented by reportID and based on actions to merge.
-    return ReportActionsUtils.getLastVisibleMessage(reportID ?? '-1', canUserPerformWriteAction(report), actionsToMerge);
+    return ReportActionsUtils.getLastVisibleMessage(reportID, canUserPerformWriteAction(report), actionsToMerge);
 }
 
 /**
@@ -2906,11 +2922,10 @@ function requiresAttentionFromCurrentUser(optionOrReport: OnyxEntry<Report> | Op
 }
 
 /**
- * Returns number of transactions that are nonReimbursable
- *
+ * Checks if the report contains at least one Non-Reimbursable transaction
  */
 function hasNonReimbursableTransactions(iouReportID: string | undefined): boolean {
-    const transactions = reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactions = getReportTransactions(iouReportID);
     return transactions.filter((transaction) => transaction.reimbursable === false).length > 0;
 }
 
@@ -2956,7 +2971,7 @@ function getMoneyRequestSpendBreakdown(report: OnyxInputOrEntry<Report>, allRepo
  */
 function getPolicyExpenseChatName(report: OnyxEntry<Report>, policy?: OnyxEntry<Policy>): string | undefined {
     const ownerAccountID = report?.ownerAccountID;
-    const personalDetails = allPersonalDetails?.[ownerAccountID ?? -1];
+    const personalDetails = ownerAccountID ? allPersonalDetails?.[ownerAccountID] : undefined;
     const login = personalDetails ? personalDetails.login : null;
     // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
     const reportOwnerDisplayName = getDisplayNameForParticipant(ownerAccountID) || login || report?.reportName;
@@ -2975,7 +2990,7 @@ function getPolicyExpenseChatName(report: OnyxEntry<Report>, policy?: OnyxEntry<
     // If this user is not admin and this policy expense chat has been archived because of account merging, this must be an old workspace chat
     // of the account which was merged into the current user's account. Use the name of the policy as the name of the report.
     if (isArchivedRoom(report, getReportNameValuePairs(report?.reportID))) {
-        const lastAction = ReportActionsUtils.getLastVisibleAction(report?.reportID ?? '-1');
+        const lastAction = ReportActionsUtils.getLastVisibleAction(report?.reportID);
         const archiveReason = ReportActionsUtils.isClosedAction(lastAction) ? ReportActionsUtils.getOriginalMessage(lastAction)?.reason : CONST.REPORT.ARCHIVE_REASON.DEFAULT;
         if (archiveReason === CONST.REPORT.ARCHIVE_REASON.ACCOUNT_MERGED && policyExpenseChatRole !== CONST.POLICY.ROLE.ADMIN) {
             return getPolicyName(report, false, policy);
@@ -3006,7 +3021,7 @@ function isReportFieldOfTypeTitle(reportField: OnyxEntry<PolicyReportField>): bo
 /**
  * Check if Report has any held expenses
  */
-function isHoldCreator(transaction: OnyxEntry<Transaction>, reportID: string): boolean {
+function isHoldCreator(transaction: OnyxEntry<Transaction>, reportID: string | undefined): boolean {
     const holdReportAction = ReportActionsUtils.getReportAction(reportID, `${transaction?.comment?.hold ?? ''}`);
     return isActionCreator(holdReportAction);
 }
@@ -3022,7 +3037,7 @@ function isReportFieldDisabled(report: OnyxEntry<Report>, reportField: OnyxEntry
     const isReportSettled = isSettled(report?.reportID);
     const isReportClosed = isClosedReport(report);
     const isTitleField = isReportFieldOfTypeTitle(reportField);
-    const isAdmin = isPolicyAdmin(report?.policyID ?? '-1', {[`${ONYXKEYS.COLLECTION.POLICY}${policy?.id ?? '-1'}`]: policy});
+    const isAdmin = isPolicyAdmin(report?.policyID, {[`${ONYXKEYS.COLLECTION.POLICY}${policy?.id}`]: policy});
     return isTitleField ? !reportField?.deletable : !isAdmin && (isReportSettled || isReportClosed);
 }
 
@@ -3053,7 +3068,7 @@ function getReportFieldKey(reportFieldId: string | undefined) {
 /**
  * Get the report fields attached to the policy given policyID
  */
-function getReportFieldsByPolicyID(policyID: string): Record<string, PolicyReportField> {
+function getReportFieldsByPolicyID(policyID: string | undefined): Record<string, PolicyReportField> {
     const policyReportFields = Object.entries(allPolicies ?? {}).find(([key]) => key.replace(ONYXKEYS.COLLECTION.POLICY, '') === policyID);
     const fieldList = policyReportFields?.[1]?.fieldList;
 
@@ -3105,8 +3120,8 @@ function getAvailableReportFields(report: Report, policyReportFields: PolicyRepo
  * Get the title for an IOU or expense chat which will be showing the payer and the amount
  */
 function getMoneyRequestReportName(report: OnyxEntry<Report>, policy?: OnyxEntry<Policy>, invoiceReceiverPolicy?: OnyxEntry<Policy>): string {
-    const isReportSettled = isSettled(report?.reportID ?? '-1');
-    const reportFields = isReportSettled ? report?.fieldList : getReportFieldsByPolicyID(report?.policyID ?? '-1');
+    const isReportSettled = isSettled(report?.reportID);
+    const reportFields = isReportSettled ? report?.fieldList : getReportFieldsByPolicyID(report?.policyID);
     const titleReportField = Object.values(reportFields ?? {}).find((reportField) => reportField?.fieldID === CONST.REPORT_FIELD_TITLE_FIELD_ID);
 
     if (titleReportField && report?.reportName && isPaidGroupPolicyExpenseReport(report)) {
@@ -3229,7 +3244,7 @@ function canEditMoneyRequest(reportAction: OnyxInputOrEntry<ReportAction<typeof
         return false;
     }
 
-    const moneyRequestReportID = originalMessage?.IOUReportID ?? -1;
+    const moneyRequestReportID = originalMessage?.IOUReportID;
 
     if (!moneyRequestReportID) {
         return actionType === CONST.IOU.REPORT_ACTION_TYPE.TRACK;
@@ -3243,7 +3258,7 @@ function canEditMoneyRequest(reportAction: OnyxInputOrEntry<ReportAction<typeof
         return isSubmitted && isRequestor;
     }
 
-    const policy = getPolicy(moneyRequestReport?.policyID ?? '-1');
+    const policy = getPolicy(moneyRequestReport?.policyID);
     const isAdmin = policy?.role === CONST.POLICY.ROLE.ADMIN;
     const isManager = currentUserAccountID === moneyRequestReport?.managerID;
 
@@ -3359,7 +3374,7 @@ function canHoldUnholdReportAction(reportAction: OnyxInputOrEntry<ReportAction>)
         return {canHoldRequest: false, canUnholdRequest: false};
     }
 
-    const moneyRequestReportID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUReportID ?? 0;
+    const moneyRequestReportID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUReportID;
     const moneyRequestReport = getReportOrDraftReport(String(moneyRequestReportID));
 
     if (!moneyRequestReportID || !moneyRequestReport) {
@@ -3375,7 +3390,7 @@ function canHoldUnholdReportAction(reportAction: OnyxInputOrEntry<ReportAction>)
 
     const isRequestSettled = isSettled(moneyRequestReport?.reportID);
     const isApproved = isReportApproved(moneyRequestReport);
-    const transactionID = moneyRequestReport ? ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID : 0;
+    const transactionID = moneyRequestReport ? ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID : undefined;
     const transaction = allTransactions?.[`${ONYXKEYS.COLLECTION.TRANSACTION}${transactionID}`] ?? ({} as Transaction);
 
     const parentReportAction = isThread(moneyRequestReport)
@@ -3383,7 +3398,7 @@ function canHoldUnholdReportAction(reportAction: OnyxInputOrEntry<ReportAction>)
         : undefined;
 
     const isRequestIOU = isIOUReport(moneyRequestReport);
-    const isHoldActionCreator = isHoldCreator(transaction, reportAction.childReportID ?? '-1');
+    const isHoldActionCreator = isHoldCreator(transaction, reportAction.childReportID);
 
     const isTrackExpenseMoneyReport = isTrackExpenseReport(moneyRequestReport);
     const isActionOwner =
@@ -3391,7 +3406,7 @@ function canHoldUnholdReportAction(reportAction: OnyxInputOrEntry<ReportAction>)
         typeof currentUserPersonalDetails?.accountID === 'number' &&
         parentReportAction.actorAccountID === currentUserPersonalDetails?.accountID;
     const isApprover = isMoneyRequestReport(moneyRequestReport) && moneyRequestReport?.managerID !== null && currentUserPersonalDetails?.accountID === moneyRequestReport?.managerID;
-    const isAdmin = isPolicyAdmin(moneyRequestReport.policyID ?? '-1', allPolicies);
+    const isAdmin = isPolicyAdmin(moneyRequestReport.policyID, allPolicies);
     const isOnHold = TransactionUtils.isOnHold(transaction);
     const isScanning = TransactionUtils.hasReceipt(transaction) && TransactionUtils.isReceiptBeingScanned(transaction);
     const isClosed = isClosedReport(moneyRequestReport);
@@ -3413,25 +3428,31 @@ const changeMoneyRequestHoldStatus = (reportAction: OnyxEntry<ReportAction>, bac
     if (!ReportActionsUtils.isMoneyRequestAction(reportAction)) {
         return;
     }
-    const moneyRequestReportID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUReportID ?? 0;
+    const moneyRequestReportID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUReportID;
 
     const moneyRequestReport = getReportOrDraftReport(String(moneyRequestReportID));
     if (!moneyRequestReportID || !moneyRequestReport) {
         return;
     }
 
-    const transactionID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID ?? '';
+    const transactionID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID;
+
+    if (!transactionID || !reportAction.childReportID) {
+        Log.warn('Missing transactionID and reportAction.childReportID during the change of the money request hold status');
+        return;
+    }
+
     const transaction = allTransactions?.[`${ONYXKEYS.COLLECTION.TRANSACTION}${transactionID}`] ?? ({} as Transaction);
     const isOnHold = TransactionUtils.isOnHold(transaction);
     const policy = allPolicies?.[`${ONYXKEYS.COLLECTION.POLICY}${moneyRequestReport.policyID}`] ?? null;
 
     if (isOnHold) {
-        IOU.unholdRequest(transactionID, reportAction.childReportID ?? '', searchHash);
+        IOU.unholdRequest(transactionID, reportAction.childReportID, searchHash);
     } else {
         const activeRoute = encodeURIComponent(Navigation.getActiveRouteWithoutParams());
         Navigation.navigate(
             // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
-            ROUTES.MONEY_REQUEST_HOLD_REASON.getRoute(policy?.type ?? CONST.POLICY.TYPE.PERSONAL, transactionID, reportAction.childReportID ?? '', backTo || activeRoute, searchHash),
+            ROUTES.MONEY_REQUEST_HOLD_REASON.getRoute(policy?.type ?? CONST.POLICY.TYPE.PERSONAL, transactionID, reportAction.childReportID, backTo || activeRoute, searchHash),
         );
     }
 };
@@ -3440,7 +3461,7 @@ const changeMoneyRequestHoldStatus = (reportAction: OnyxEntry<ReportAction>, bac
  * Gets all transactions on an IOU report with a receipt
  */
 function getTransactionsWithReceipts(iouReportID: string | undefined): Transaction[] {
-    const transactions = reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactions = getReportTransactions(iouReportID);
     return transactions.filter((transaction) => TransactionUtils.hasReceipt(transaction));
 }
 
@@ -3467,10 +3488,10 @@ function areAllRequestsBeingSmartScanned(iouReportID: string, reportPreviewActio
  * NOTE: This method is only meant to be used inside this action file. Do not export and use it elsewhere. Use withOnyx or Onyx.connect() instead.
  */
 function getLinkedTransaction(reportAction: OnyxEntry<ReportAction | OptimisticIOUReportAction>): OnyxEntry<Transaction> {
-    let transactionID = '';
+    let transactionID;
 
     if (ReportActionsUtils.isMoneyRequestAction(reportAction)) {
-        transactionID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID ?? '-1';
+        transactionID = ReportActionsUtils.getOriginalMessage(reportAction)?.IOUTransactionID;
     }
 
     return allTransactions?.[`${ONYXKEYS.COLLECTION.TRANSACTION}${transactionID}`];
@@ -3480,7 +3501,7 @@ function getLinkedTransaction(reportAction: OnyxEntry<ReportAction | OptimisticI
  * Check if any of the transactions in the report has required missing fields
  */
 function hasMissingSmartscanFields(iouReportID: string): boolean {
-    const reportTransactions = reportsTransactions[iouReportID] ?? [];
+    const reportTransactions = getReportTransactions(iouReportID);
 
     return reportTransactions.some(TransactionUtils.hasMissingSmartscanFields);
 }
@@ -3488,7 +3509,7 @@ function hasMissingSmartscanFields(iouReportID: string): boolean {
 /**
  * Get report action which is missing smartscan fields
  */
-function getReportActionWithMissingSmartscanFields(iouReportID: string): ReportAction | undefined {
+function getReportActionWithMissingSmartscanFields(iouReportID: string | undefined): ReportAction | undefined {
     const reportActions = Object.values(ReportActionsUtils.getAllReportActions(iouReportID));
     return reportActions.find((action) => {
         if (!ReportActionsUtils.isMoneyRequestAction(action)) {
@@ -3508,7 +3529,7 @@ function getReportActionWithMissingSmartscanFields(iouReportID: string): ReportA
 /**
  * Check if iouReportID has required missing fields
  */
-function shouldShowRBRForMissingSmartscanFields(iouReportID: string): boolean {
+function shouldShowRBRForMissingSmartscanFields(iouReportID: string | undefined): boolean {
     return !!getReportActionWithMissingSmartscanFields(iouReportID);
 }
 
@@ -3683,7 +3704,7 @@ function getReportPreviewMessage(
     }
 
     if (report.isWaitingOnBankAccount) {
-        const submitterDisplayName = getDisplayNameForParticipant(report.ownerAccountID ?? -1, true) ?? '';
+        const submitterDisplayName = getDisplayNameForParticipant(report.ownerAccountID, true) ?? '';
         return Localize.translateLocal('iou.waitingOnBankAccount', {submitterDisplayName});
     }
 
@@ -3883,7 +3904,7 @@ function getInvoicePayerName(report: OnyxEntry<Report>, invoiceReceiverPolicy?:
 /**
  * Parse html of reportAction into text
  */
-function parseReportActionHtmlToText(reportAction: OnyxEntry<ReportAction>, reportID: string, childReportID?: string): string {
+function parseReportActionHtmlToText(reportAction: OnyxEntry<ReportAction>, reportID: string | undefined, childReportID?: string): string {
     if (!reportAction) {
         return '';
     }
@@ -3947,7 +3968,7 @@ function getReportActionMessage(reportAction: OnyxEntry<ReportAction>, reportID?
         return getReimbursementQueuedActionMessage(reportAction, getReportOrDraftReport(reportID), false);
     }
 
-    return parseReportActionHtmlToText(reportAction, reportID ?? '', childReportID);
+    return parseReportActionHtmlToText(reportAction, reportID, childReportID);
 }
 
 /**
@@ -3956,8 +3977,8 @@ function getReportActionMessage(reportAction: OnyxEntry<ReportAction>, reportID?
 function getInvoicesChatName(report: OnyxEntry<Report>, receiverPolicy: OnyxEntry<Policy>): string {
     const invoiceReceiver = report?.invoiceReceiver;
     const isIndividual = invoiceReceiver?.type === CONST.REPORT.INVOICE_RECEIVER_TYPE.INDIVIDUAL;
-    const invoiceReceiverAccountID = isIndividual ? invoiceReceiver.accountID : -1;
-    const invoiceReceiverPolicyID = isIndividual ? '' : invoiceReceiver?.policyID ?? '-1';
+    const invoiceReceiverAccountID = isIndividual ? invoiceReceiver.accountID : CONST.DEFAULT_NUMBER_ID;
+    const invoiceReceiverPolicyID = isIndividual ? undefined : invoiceReceiver?.policyID;
     const invoiceReceiverPolicy = receiverPolicy ?? getPolicy(invoiceReceiverPolicyID);
     const isCurrentUserReceiver = (isIndividual && invoiceReceiverAccountID === currentUserAccountID) || (!isIndividual && PolicyUtils.isPolicyAdmin(invoiceReceiverPolicy));
 
@@ -4058,7 +4079,7 @@ function getReportName(
         }
 
         const isAttachment = ReportActionsUtils.isReportActionAttachment(!isEmptyObject(parentReportAction) ? parentReportAction : undefined);
-        const reportActionMessage = getReportActionMessage(parentReportAction, report?.parentReportID, report?.reportID ?? '').replace(/(\n+|\r\n|\n|\r)/gm, ' ');
+        const reportActionMessage = getReportActionMessage(parentReportAction, report?.parentReportID, report?.reportID).replace(/(\n+|\r\n|\n|\r)/gm, ' ');
         if (isAttachment && reportActionMessage) {
             return `[${Localize.translateLocal('common.attachment')}]`;
         }
@@ -4271,7 +4292,11 @@ function goBackToDetailsPage(report: OnyxEntry<Report>, backTo?: string) {
         return;
     }
 
-    Navigation.goBack(ROUTES.REPORT_SETTINGS.getRoute(report?.reportID ?? '-1', backTo));
+    if (report?.reportID) {
+        Navigation.goBack(ROUTES.REPORT_SETTINGS.getRoute(report.reportID, backTo));
+    } else {
+        Log.warn('Missing reportID during navigation back to the details page');
+    }
 }
 
 function navigateBackOnDeleteTransaction(backRoute: Route | undefined, isFromRHP?: boolean) {
@@ -4458,7 +4483,7 @@ function buildOptimisticAddCommentReportAction(
 
     const isAttachmentOnly = file && !text;
     const isAttachmentWithText = !!text && file !== undefined;
-    const accountID = actorAccountID ?? currentUserAccountID ?? -1;
+    const accountID = actorAccountID ?? currentUserAccountID ?? CONST.DEFAULT_NUMBER_ID;
     const delegateAccountDetails = PersonalDetailsUtils.getPersonalDetailByEmail(delegateEmail);
 
     // Remove HTML from text when applying optimistic offline comment
@@ -4618,7 +4643,7 @@ function buildOptimisticIOUReport(
     const formattedTotal = CurrencyUtils.convertToDisplayString(total, currency);
     const personalDetails = getPersonalDetailsForAccountID(payerAccountID);
     const payerEmail = 'login' in personalDetails ? personalDetails.login : '';
-    const policyID = getReport(chatReportID)?.policyID ?? '-1';
+    const policyID = getReport(chatReportID)?.policyID;
     const policy = getPolicy(policyID);
 
     const participants: Participants = {
@@ -4684,8 +4709,7 @@ function populateOptimisticReportFormula(formula: string, report: OptimisticExpe
 /** Builds an optimistic invoice report with a randomly generated reportID */
 function buildOptimisticInvoiceReport(chatReportID: string, policyID: string, receiverAccountID: number, receiverName: string, total: number, currency: string): OptimisticExpenseReport {
     const formattedTotal = CurrencyUtils.convertToDisplayString(total, currency);
-
-    return {
+    const invoiceReport = {
         reportID: generateReportID(),
         chatReportID,
         policyID,
@@ -4699,9 +4723,6 @@ function buildOptimisticInvoiceReport(chatReportID: string, policyID: string, re
         statusNum: CONST.REPORT.STATUS_NUM.OPEN,
         total,
         participants: {
-            [currentUserAccountID ?? -1]: {
-                notificationPreference: CONST.REPORT.NOTIFICATION_PREFERENCE.HIDDEN,
-            },
             [receiverAccountID]: {
                 notificationPreference: CONST.REPORT.NOTIFICATION_PREFERENCE.HIDDEN,
             },
@@ -4709,6 +4730,12 @@ function buildOptimisticInvoiceReport(chatReportID: string, policyID: string, re
         parentReportID: chatReportID,
         lastVisibleActionCreated: DateUtils.getDBTime(),
     };
+
+    if (currentUserAccountID) {
+        invoiceReport.participants[currentUserAccountID] = {notificationPreference: CONST.REPORT.NOTIFICATION_PREFERENCE.HIDDEN};
+    }
+
+    return invoiceReport;
 }
 
 /**
@@ -5035,8 +5062,8 @@ function buildOptimisticIOUReportAction(
             originalMessage.participantAccountIDs = currentUserAccountID ? [currentUserAccountID] : [];
         } else {
             originalMessage.participantAccountIDs = currentUserAccountID
-                ? [currentUserAccountID, ...participants.map((participant) => participant.accountID ?? -1)]
-                : participants.map((participant) => participant.accountID ?? -1);
+                ? [currentUserAccountID, ...participants.map((participant) => participant.accountID ?? CONST.DEFAULT_NUMBER_ID)]
+                : participants.map((participant) => participant.accountID ?? CONST.DEFAULT_NUMBER_ID);
         }
     }
 
@@ -5247,14 +5274,14 @@ function buildOptimisticReportPreview(
             },
         ],
         created,
-        accountID: iouReport?.managerID ?? -1,
+        accountID: iouReport?.managerID,
         // The preview is initially whispered if created with a receipt, so the actor is the current user as well
         actorAccountID: hasReceipt ? currentUserAccountID : reportActorAccountID,
         childReportID: childReportID ?? iouReport?.reportID,
         childMoneyRequestCount: 1,
         childLastActorAccountID: currentUserAccountID,
         childLastMoneyRequestComment: comment,
-        childRecentReceiptTransactionIDs: hasReceipt && !isEmptyObject(transaction) ? {[transaction?.transactionID ?? '-1']: created} : undefined,
+        childRecentReceiptTransactionIDs: hasReceipt && !isEmptyObject(transaction) && transaction?.transactionID ? {[transaction.transactionID]: created} : undefined,
     };
 }
 
@@ -5432,11 +5459,13 @@ function updateReportPreview(
             : recentReceiptTransactions,
         // As soon as we add a transaction without a receipt to the report, it will have ready expenses,
         // so we remove the whisper
-        originalMessage: {
-            ...(originalMessage ?? {}),
-            whisperedTo: hasReceipt ? originalMessage?.whisperedTo : [],
-            linkedReportID: originalMessage?.linkedReportID ?? '0',
-        },
+        originalMessage: originalMessage
+            ? {
+                  ...originalMessage,
+                  whisperedTo: hasReceipt ? originalMessage.whisperedTo : [],
+                  linkedReportID: originalMessage.linkedReportID,
+              }
+            : undefined,
     };
 }
 
@@ -6086,7 +6115,7 @@ function buildOptimisticWorkspaceChats(policyID: string, policyName: string, exp
     const pendingChatMembers = getPendingChatMembers(currentUserAccountID ? [currentUserAccountID] : [], [], CONST.RED_BRICK_ROAD_PENDING_ACTION.ADD);
     const adminsChatData = {
         ...buildOptimisticChatReport(
-            [currentUserAccountID ?? -1],
+            currentUserAccountID ? [currentUserAccountID] : [],
             CONST.REPORT.WORKSPACE_CHAT_ROOMS.ADMINS,
             CONST.REPORT.CHAT_TYPE.POLICY_ADMINS,
             policyID,
@@ -6102,7 +6131,7 @@ function buildOptimisticWorkspaceChats(policyID: string, policyName: string, exp
     };
 
     const expenseChatData = buildOptimisticChatReport(
-        [currentUserAccountID ?? -1],
+        currentUserAccountID ? [currentUserAccountID] : [],
         '',
         CONST.REPORT.CHAT_TYPE.POLICY_EXPENSE_CHAT,
         policyID,
@@ -6246,7 +6275,7 @@ function buildTransactionThread(
         participantAccountIDs,
         getTransactionReportName(reportAction),
         undefined,
-        moneyRequestReport?.policyID ?? '-1',
+        moneyRequestReport?.policyID,
         CONST.POLICY.OWNER_ACCOUNT_ID_FAKE,
         false,
         '',
@@ -6427,7 +6456,7 @@ function shouldDisplayViolationsRBRInLHN(report: OnyxEntry<Report>, transactionV
     }
 
     // We only show the RBR to the submitter
-    if (!isCurrentUserSubmitter(report.reportID ?? '')) {
+    if (!isCurrentUserSubmitter(report.reportID)) {
         return false;
     }
 
@@ -6447,7 +6476,7 @@ function shouldDisplayViolationsRBRInLHN(report: OnyxEntry<Report>, transactionV
  * Checks to see if a report contains a violation
  */
 function hasViolations(reportID: string, transactionViolations: OnyxCollection<TransactionViolation[]>, shouldShowInReview?: boolean): boolean {
-    const transactions = reportsTransactions[reportID] ?? [];
+    const transactions = getReportTransactions(reportID);
     return transactions.some((transaction) => TransactionUtils.hasViolation(transaction.transactionID, transactionViolations, shouldShowInReview));
 }
 
@@ -6455,7 +6484,7 @@ function hasViolations(reportID: string, transactionViolations: OnyxCollection<T
  * Checks to see if a report contains a violation of type `warning`
  */
 function hasWarningTypeViolations(reportID: string, transactionViolations: OnyxCollection<TransactionViolation[]>, shouldShowInReview?: boolean): boolean {
-    const transactions = reportsTransactions[reportID] ?? [];
+    const transactions = getReportTransactions(reportID);
     return transactions.some((transaction) => TransactionUtils.hasWarningTypeViolation(transaction.transactionID, transactionViolations, shouldShowInReview));
 }
 
@@ -6463,7 +6492,7 @@ function hasWarningTypeViolations(reportID: string, transactionViolations: OnyxC
  * Checks to see if a report contains a violation of type `notice`
  */
 function hasNoticeTypeViolations(reportID: string, transactionViolations: OnyxCollection<TransactionViolation[]>, shouldShowInReview?: boolean): boolean {
-    const transactions = reportsTransactions[reportID] ?? [];
+    const transactions = getReportTransactions(reportID);
     return transactions.some((transaction) => TransactionUtils.hasNoticeTypeViolation(transaction.transactionID, transactionViolations, shouldShowInReview));
 }
 
@@ -6479,7 +6508,7 @@ function hasReportViolations(reportID: string) {
 function shouldAdminsRoomBeVisible(report: OnyxEntry<Report>): boolean {
     const accountIDs = Object.entries(report?.participants ?? {}).map(([accountID]) => Number(accountID));
     const adminAccounts = PersonalDetailsUtils.getLoginsByAccountIDs(accountIDs).filter((login) => !PolicyUtils.isExpensifyTeam(login));
-    const lastVisibleAction = ReportActionsUtils.getLastVisibleAction(report?.reportID ?? '');
+    const lastVisibleAction = ReportActionsUtils.getLastVisibleAction(report?.reportID);
     if ((lastVisibleAction ? ReportActionsUtils.isCreatedAction(lastVisibleAction) : report?.lastActionType === CONST.REPORT.ACTIONS.TYPE.CREATED) && adminAccounts.length <= 1) {
         return false;
     }
@@ -6508,7 +6537,7 @@ function getAllReportActionsErrorsAndReportActionThatRequiresAttention(report: O
     const parentReportAction: OnyxEntry<ReportAction> =
         !report?.parentReportID || !report?.parentReportActionID
             ? undefined
-            : allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${report.parentReportID ?? '-1'}`]?.[report.parentReportActionID ?? '-1'];
+            : allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${report.parentReportID}`]?.[report.parentReportActionID];
 
     if (!isArchivedRoom(report)) {
         if (ReportActionsUtils.wasActionTakenByCurrentUser(parentReportAction) && ReportActionsUtils.isTransactionThread(parentReportAction)) {
@@ -6519,9 +6548,9 @@ function getAllReportActionsErrorsAndReportActionThatRequiresAttention(report: O
                 reportAction = undefined;
             }
         } else if ((isIOUReport(report) || isExpenseReport(report)) && report?.ownerAccountID === currentUserAccountID) {
-            if (shouldShowRBRForMissingSmartscanFields(report?.reportID ?? '-1') && !isSettled(report?.reportID)) {
+            if (shouldShowRBRForMissingSmartscanFields(report?.reportID) && !isSettled(report?.reportID)) {
                 reportActionErrors.smartscan = ErrorUtils.getMicroSecondOnyxErrorWithTranslationKey('iou.error.genericSmartscanFailureMessage');
-                reportAction = getReportActionWithMissingSmartscanFields(report?.reportID ?? '-1');
+                reportAction = getReportActionWithMissingSmartscanFields(report?.reportID);
             }
         } else if (hasSmartscanError(reportActionsArray)) {
             reportActionErrors.smartscan = ErrorUtils.getMicroSecondOnyxErrorWithTranslationKey('iou.error.genericSmartscanFailureMessage');
@@ -6641,7 +6670,7 @@ function reasonForReportToBeInOptionList({
     }
 
     // If this is a transaction thread associated with a report that only has one transaction, omit it
-    if (isOneTransactionThread(report.reportID, report.parentReportID ?? '-1', parentReportAction)) {
+    if (isOneTransactionThread(report.reportID, report.parentReportID, parentReportAction)) {
         return null;
     }
 
@@ -6724,11 +6753,7 @@ function reasonForReportToBeInOptionList({
     }
 
     // Hide chat threads where the parent message is pending removal
-    if (
-        !isEmptyObject(parentReportAction) &&
-        ReportActionsUtils.isPendingRemove(parentReportAction) &&
-        ReportActionsUtils.isThreadParentMessage(parentReportAction, report?.reportID ?? '')
-    ) {
+    if (!isEmptyObject(parentReportAction) && ReportActionsUtils.isPendingRemove(parentReportAction) && ReportActionsUtils.isThreadParentMessage(parentReportAction, report?.reportID)) {
         return null;
     }
 
@@ -6793,10 +6818,11 @@ function getInvoiceChatByParticipants(receiverID: string | number, receiverType:
 /**
  * Attempts to find a policy expense report in onyx that is owned by ownerAccountID in a given policy
  */
-function getPolicyExpenseChat(ownerAccountID: number, policyID: string | undefined): OnyxEntry<Report> {
-    if (!policyID) {
+function getPolicyExpenseChat(ownerAccountID: number | undefined, policyID: string | undefined): OnyxEntry<Report> {
+    if (!ownerAccountID || !policyID) {
         return;
     }
+
     return Object.values(allReports ?? {}).find((report: OnyxEntry<Report>) => {
         // If the report has been deleted, then skip it
         if (!report) {
@@ -6878,21 +6904,6 @@ function shouldShowFlagComment(reportAction: OnyxInputOrEntry<ReportAction>, rep
     );
 }
 
-/**
- * @param sortedAndFilteredReportActions - reportActions for the report, sorted newest to oldest, and filtered for only those that should be visible
- */
-function getNewMarkerReportActionID(report: OnyxEntry<Report>, sortedAndFilteredReportActions: ReportAction[]): string {
-    if (!isUnread(report)) {
-        return '';
-    }
-
-    const newMarkerIndex = lodashFindLastIndex(sortedAndFilteredReportActions, (reportAction) => (reportAction.created ?? '') > (report?.lastReadTime ?? ''));
-
-    return newMarkerIndex !== -1 && 'reportActionID' in (sortedAndFilteredReportActions?.at(newMarkerIndex) ?? {})
-        ? sortedAndFilteredReportActions.at(newMarkerIndex)?.reportActionID ?? ''
-        : '';
-}
-
 /**
  * Performs the markdown conversion, and replaces code points > 127 with C escape sequences
  * Used for compatibility with the backend auth validator for AddComment, and to account for MD in comments
@@ -7076,7 +7087,7 @@ function getMoneyRequestOptions(report: OnyxEntry<Report>, policy: OnyxEntry<Pol
     }
 
     if (isInvoiceRoom(report)) {
-        if (PolicyUtils.canSendInvoiceFromWorkspace(policy?.id) && isPolicyAdmin(report?.policyID ?? '-1', allPolicies)) {
+        if (PolicyUtils.canSendInvoiceFromWorkspace(policy?.id) && isPolicyAdmin(report?.policyID, allPolicies)) {
             return [CONST.IOU.TYPE.INVOICE];
         }
         return [];
@@ -7084,7 +7095,8 @@ function getMoneyRequestOptions(report: OnyxEntry<Report>, policy: OnyxEntry<Pol
 
     // We don't allow IOU actions if an Expensify account is a participant of the report, unless the policy that the report is on is owned by an Expensify account
     const doParticipantsIncludeExpensifyAccounts = lodashIntersection(reportParticipants, CONST.EXPENSIFY_ACCOUNT_IDS).length > 0;
-    const isPolicyOwnedByExpensifyAccounts = report?.policyID ? CONST.EXPENSIFY_ACCOUNT_IDS.includes(getPolicy(report?.policyID ?? '-1')?.ownerAccountID ?? -1) : false;
+    const policyOwnerAccountID = getPolicy(report?.policyID)?.ownerAccountID;
+    const isPolicyOwnedByExpensifyAccounts = policyOwnerAccountID ? CONST.EXPENSIFY_ACCOUNT_IDS.includes(policyOwnerAccountID) : false;
     if (doParticipantsIncludeExpensifyAccounts && !isPolicyOwnedByExpensifyAccounts) {
         return [];
     }
@@ -7198,7 +7210,7 @@ function canLeaveRoom(report: OnyxEntry<Report>, isPolicyEmployee: boolean): boo
             return false;
         }
 
-        const invoiceReport = getReportOrDraftReport(report?.iouReportID ?? '-1');
+        const invoiceReport = getReportOrDraftReport(report?.iouReportID);
 
         if (invoiceReport?.ownerAccountID === currentUserAccountID) {
             return false;
@@ -7281,7 +7293,7 @@ function shouldReportShowSubscript(report: OnyxEntry<Report>): boolean {
         return true;
     }
 
-    if (isExpenseReport(report) && isOneTransactionReport(report?.reportID ?? '-1')) {
+    if (isExpenseReport(report) && isOneTransactionReport(report?.reportID)) {
         return true;
     }
 
@@ -7332,7 +7344,7 @@ function isMoneyRequestReportPendingDeletion(reportOrID: OnyxEntry<Report> | str
         return false;
     }
 
-    const parentReportAction = ReportActionsUtils.getReportAction(report?.parentReportID ?? '-1', report?.parentReportActionID ?? '-1');
+    const parentReportAction = ReportActionsUtils.getReportAction(report?.parentReportID, report?.parentReportActionID);
     return parentReportAction?.pendingAction === CONST.RED_BRICK_ROAD_PENDING_ACTION.DELETE;
 }
 
@@ -7353,7 +7365,7 @@ function canUserPerformWriteAction(report: OnyxEntry<Report>) {
  */
 function getOriginalReportID(reportID: string, reportAction: OnyxInputOrEntry<ReportAction>): string | undefined {
     const reportActions = allReportActions?.[`${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${reportID}`];
-    const currentReportAction = reportActions?.[reportAction?.reportActionID ?? '-1'] ?? null;
+    const currentReportAction = reportAction?.reportActionID ? reportActions?.[reportAction.reportActionID] : undefined;
     const transactionThreadReportID = ReportActionsUtils.getOneTransactionThreadReportID(reportID, reportActions ?? ([] as ReportAction[]));
     const isThreadReportParentAction = reportAction?.childReportID?.toString() === reportID;
     if (Object.keys(currentReportAction ?? {}).length === 0) {
@@ -7398,7 +7410,9 @@ function canCreateRequest(report: OnyxEntry<Report>, policy: OnyxEntry<Policy>,
 }
 
 function getWorkspaceChats(policyID: string, accountIDs: number[], reports: OnyxCollection<Report> = allReports): Array<OnyxEntry<Report>> {
-    return Object.values(reports ?? {}).filter((report) => isPolicyExpenseChat(report) && (report?.policyID ?? '-1') === policyID && accountIDs.includes(report?.ownerAccountID ?? -1));
+    return Object.values(reports ?? {}).filter(
+        (report) => isPolicyExpenseChat(report) && report?.policyID === policyID && report?.ownerAccountID && accountIDs.includes(report?.ownerAccountID),
+    );
 }
 
 /**
@@ -7407,7 +7421,7 @@ function getWorkspaceChats(policyID: string, accountIDs: number[], reports: Onyx
  * @param policyID - the workspace ID to get all associated reports
  */
 function getAllWorkspaceReports(policyID: string): Array<OnyxEntry<Report>> {
-    return Object.values(allReports ?? {}).filter((report) => (report?.policyID ?? '-1') === policyID);
+    return Object.values(allReports ?? {}).filter((report) => report?.policyID === policyID);
 }
 
 /**
@@ -7557,7 +7571,7 @@ function getTaskAssigneeChatOnyxData(
             {
                 onyxMethod: Onyx.METHOD.MERGE,
                 key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${assigneeChatReportID}`,
-                value: {[optimisticAssigneeAddComment.reportAction.reportActionID ?? '-1']: optimisticAssigneeAddComment.reportAction as ReportAction},
+                value: {[optimisticAssigneeAddComment.reportAction.reportActionID]: optimisticAssigneeAddComment.reportAction as ReportAction},
             },
             {
                 onyxMethod: Onyx.METHOD.MERGE,
@@ -7568,12 +7582,12 @@ function getTaskAssigneeChatOnyxData(
         successData.push({
             onyxMethod: Onyx.METHOD.MERGE,
             key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${assigneeChatReportID}`,
-            value: {[optimisticAssigneeAddComment.reportAction.reportActionID ?? '-1']: {isOptimisticAction: null}},
+            value: {[optimisticAssigneeAddComment.reportAction.reportActionID]: {isOptimisticAction: null}},
         });
         failureData.push({
             onyxMethod: Onyx.METHOD.MERGE,
             key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${assigneeChatReportID}`,
-            value: {[optimisticAssigneeAddComment.reportAction.reportActionID ?? '-1']: {pendingAction: null}},
+            value: {[optimisticAssigneeAddComment.reportAction.reportActionID]: {pendingAction: null}},
         });
     }
 
@@ -7606,7 +7620,7 @@ function getIOUReportActionDisplayMessage(reportAction: OnyxEntry<ReportAction>,
 
         switch (originalMessage.paymentType) {
             case CONST.IOU.PAYMENT_TYPE.ELSEWHERE:
-                translationKey = hasMissingInvoiceBankAccount(IOUReportID ?? '-1') ? 'iou.payerSettledWithMissingBankAccount' : 'iou.paidElsewhereWithAmount';
+                translationKey = hasMissingInvoiceBankAccount(IOUReportID) ? 'iou.payerSettledWithMissingBankAccount' : 'iou.paidElsewhereWithAmount';
                 break;
             case CONST.IOU.PAYMENT_TYPE.EXPENSIFY:
             case CONST.IOU.PAYMENT_TYPE.VBBA:
@@ -7693,7 +7707,7 @@ function isValidReport(report?: OnyxEntry<Report>): boolean {
 /**
  * Check to see if we are a participant of this report.
  */
-function isReportParticipant(accountID: number, report: OnyxEntry<Report>): boolean {
+function isReportParticipant(accountID: number | undefined, report: OnyxEntry<Report>): boolean {
     if (!accountID) {
         return false;
     }
@@ -7712,7 +7726,7 @@ function isReportParticipant(accountID: number, report: OnyxEntry<Report>): bool
  * Check to see if the current user has access to view the report.
  */
 function canCurrentUserOpenReport(report: OnyxEntry<Report>): boolean {
-    return (isReportParticipant(currentUserAccountID ?? 0, report) || isPublicRoom(report)) && canAccessReport(report, allPolicies, allBetas);
+    return (isReportParticipant(currentUserAccountID, report) || isPublicRoom(report)) && canAccessReport(report, allPolicies, allBetas);
 }
 
 function shouldUseFullTitleToDisplay(report: OnyxEntry<Report>): boolean {
@@ -7736,7 +7750,7 @@ function canEditReportDescription(report: OnyxEntry<Report>, policy: OnyxEntry<P
         isChatRoom(report) &&
         !isChatThread(report) &&
         !isEmpty(policy) &&
-        hasParticipantInArray(report, [currentUserAccountID ?? 0]) &&
+        hasParticipantInArray(report, currentUserAccountID ? [currentUserAccountID] : []) &&
         !isAuditor(report)
     );
 }
@@ -7758,7 +7772,7 @@ function getReportActionWithSmartscanError(reportActions: ReportAction[]): Repor
             return true;
         }
 
-        const transactionID = ReportActionsUtils.isMoneyRequestAction(action) ? ReportActionsUtils.getOriginalMessage(action)?.IOUTransactionID ?? '-1' : '-1';
+        const transactionID = ReportActionsUtils.isMoneyRequestAction(action) ? ReportActionsUtils.getOriginalMessage(action)?.IOUTransactionID : undefined;
         const transaction = allTransactions?.[`${ONYXKEYS.COLLECTION.TRANSACTION}${transactionID}`] ?? {};
         const isSplitBillError = isSplitReportAction && TransactionUtils.hasMissingSmartscanFields(transaction as Transaction);
 
@@ -7809,7 +7823,7 @@ function navigateToPrivateNotes(report: OnyxEntry<Report>, session: OnyxEntry<Se
  * Get all held transactions of a iouReport
  */
 function getAllHeldTransactions(iouReportID?: string): Transaction[] {
-    const transactions = reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactions = getReportTransactions(iouReportID);
     return transactions.filter((transaction) => TransactionUtils.isOnHold(transaction));
 }
 
@@ -7817,7 +7831,8 @@ function getAllHeldTransactions(iouReportID?: string): Transaction[] {
  * Check if Report has any held expenses
  */
 function hasHeldExpenses(iouReportID?: string, allReportTransactions?: SearchTransaction[]): boolean {
-    const transactions = allReportTransactions ?? reportsTransactions[iouReportID ?? ''] ?? [];
+    const iouReportTransactions = getReportTransactions(iouReportID);
+    const transactions = allReportTransactions ?? iouReportTransactions;
     return transactions.some((transaction) => TransactionUtils.isOnHold(transaction));
 }
 
@@ -7825,7 +7840,8 @@ function hasHeldExpenses(iouReportID?: string, allReportTransactions?: SearchTra
  * Check if all expenses in the Report are on hold
  */
 function hasOnlyHeldExpenses(iouReportID?: string, allReportTransactions?: SearchTransaction[]): boolean {
-    const reportTransactions = allReportTransactions ?? reportsTransactions[iouReportID ?? ''] ?? [];
+    const transactionsByIouReportID = getReportTransactions(iouReportID);
+    const reportTransactions = allReportTransactions ?? transactionsByIouReportID;
     return reportTransactions.length > 0 && !reportTransactions.some((transaction) => !TransactionUtils.isOnHold(transaction));
 }
 
@@ -7845,7 +7861,7 @@ function hasUpdatedTotal(report: OnyxInputOrEntry<Report>, policy: OnyxInputOrEn
         return true;
     }
 
-    const allReportTransactions = reportsTransactions[report.reportID] ?? [];
+    const allReportTransactions = getReportTransactions(report.reportID);
 
     const hasPendingTransaction = allReportTransactions.some((transaction) => !!transaction.pendingAction);
     const hasTransactionWithDifferentCurrency = allReportTransactions.some((transaction) => transaction.currency !== report.currency);
@@ -7915,7 +7931,7 @@ function getAllAncestorReportActions(report: Report | null | undefined, currentU
 
     while (parentReportID) {
         const parentReport = currentUpdatedReport && currentUpdatedReport.reportID === parentReportID ? currentUpdatedReport : getReportOrDraftReport(parentReportID);
-        const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, parentReportActionID ?? '-1');
+        const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, parentReportActionID);
 
         if (
             !parentReport ||
@@ -7957,7 +7973,7 @@ function getAllAncestorReportActionIDs(report: Report | null | undefined, includ
 
     while (parentReportID) {
         const parentReport = getReportOrDraftReport(parentReportID);
-        const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, parentReportActionID ?? '-1');
+        const parentReportAction = ReportActionsUtils.getReportAction(parentReportID, parentReportActionID);
 
         if (
             !parentReportAction ||
@@ -7968,8 +7984,10 @@ function getAllAncestorReportActionIDs(report: Report | null | undefined, includ
             break;
         }
 
-        allAncestorIDs.reportIDs.push(parentReportID ?? '-1');
-        allAncestorIDs.reportActionsIDs.push(parentReportActionID ?? '-1');
+        allAncestorIDs.reportIDs.push(parentReportID);
+        if (parentReportActionID) {
+            allAncestorIDs.reportActionsIDs.push(parentReportActionID);
+        }
 
         if (!parentReport) {
             break;
@@ -8007,7 +8025,7 @@ function getOptimisticDataForParentReportAction(reportID: string, lastVisibleAct
 
         const ancestorReportAction = ReportActionsUtils.getReportAction(ancestorReport.reportID, ancestors.reportActionsIDs.at(index) ?? '');
 
-        if (!ancestorReportAction || isEmptyObject(ancestorReportAction)) {
+        if (!ancestorReportAction?.reportActionID || isEmptyObject(ancestorReportAction)) {
             return null;
         }
 
@@ -8015,7 +8033,7 @@ function getOptimisticDataForParentReportAction(reportID: string, lastVisibleAct
             onyxMethod: Onyx.METHOD.MERGE,
             key: `${ONYXKEYS.COLLECTION.REPORT_ACTIONS}${ancestorReport.reportID}`,
             value: {
-                [ancestorReportAction?.reportActionID ?? '-1']: updateOptimisticParentReportAction(ancestorReportAction, lastVisibleActionCreated, type),
+                [ancestorReportAction.reportActionID]: updateOptimisticParentReportAction(ancestorReportAction, lastVisibleActionCreated, type),
             },
         };
     });
@@ -8120,7 +8138,7 @@ function getTripTransactions(tripRoomReportID: string | undefined, reportFieldTo
     const tripTransactionReportIDs = Object.values(allReports ?? {})
         .filter((report) => report && report?.[reportFieldToCompare] === tripRoomReportID)
         .map((report) => report?.reportID);
-    return tripTransactionReportIDs.flatMap((reportID) => reportsTransactions[reportID ?? ''] ?? []);
+    return tripTransactionReportIDs.flatMap((reportID) => getReportTransactions(reportID));
 }
 
 function getTripIDFromTransactionParentReportID(transactionParentReportID: string | undefined): string | undefined {
@@ -8138,13 +8156,13 @@ function hasActionsWithErrors(reportID: string): boolean {
 }
 
 function isNonAdminOrOwnerOfPolicyExpenseChat(report: OnyxInputOrEntry<Report>, policy: OnyxInputOrEntry<Policy>): boolean {
-    return isPolicyExpenseChat(report) && !(PolicyUtils.isPolicyAdmin(policy) || PolicyUtils.isPolicyOwner(policy, currentUserAccountID ?? -1) || isReportOwner(report));
+    return isPolicyExpenseChat(report) && !(PolicyUtils.isPolicyAdmin(policy) || PolicyUtils.isPolicyOwner(policy, currentUserAccountID) || isReportOwner(report));
 }
 
 function isAdminOwnerApproverOrReportOwner(report: OnyxEntry<Report>, policy: OnyxEntry<Policy>): boolean {
     const isApprover = isMoneyRequestReport(report) && report?.managerID !== null && currentUserPersonalDetails?.accountID === report?.managerID;
 
-    return PolicyUtils.isPolicyAdmin(policy) || PolicyUtils.isPolicyOwner(policy, currentUserAccountID ?? -1) || isReportOwner(report) || isApprover;
+    return PolicyUtils.isPolicyAdmin(policy) || PolicyUtils.isPolicyOwner(policy, currentUserAccountID) || isReportOwner(report) || isApprover;
 }
 
 /**
@@ -8300,18 +8318,22 @@ function createDraftTransactionAndNavigateToParticipantSelector(
     if (actionName === CONST.IOU.ACTION.CATEGORIZE) {
         const activePolicy = getPolicy(activePolicyID);
         if (activePolicy && activePolicy?.type !== CONST.POLICY.TYPE.PERSONAL && activePolicy?.pendingAction !== CONST.RED_BRICK_ROAD_PENDING_ACTION.DELETE) {
-            const policyExpenseReportID = getPolicyExpenseChat(currentUserAccountID ?? -1, activePolicyID ?? '-1')?.reportID ?? '-1';
+            const policyExpenseReportID = getPolicyExpenseChat(currentUserAccountID, activePolicyID)?.reportID;
             IOU.setMoneyRequestParticipants(transactionID, [
                 {
                     selected: true,
                     accountID: 0,
                     isPolicyExpenseChat: true,
                     reportID: policyExpenseReportID,
-                    policyID: activePolicyID ?? '-1',
+                    policyID: activePolicyID,
                     searchText: activePolicy?.name,
                 },
             ]);
-            Navigation.navigate(ROUTES.MONEY_REQUEST_STEP_CATEGORY.getRoute(actionName, CONST.IOU.TYPE.SUBMIT, transactionID, policyExpenseReportID));
+            if (policyExpenseReportID) {
+                Navigation.navigate(ROUTES.MONEY_REQUEST_STEP_CATEGORY.getRoute(actionName, CONST.IOU.TYPE.SUBMIT, transactionID, policyExpenseReportID));
+            } else {
+                Log.warn('policyExpenseReportID is not valid during expense categorizing');
+            }
             return;
         }
         if (filteredPolicies.length === 0 || filteredPolicies.length > 1) {
@@ -8320,18 +8342,22 @@ function createDraftTransactionAndNavigateToParticipantSelector(
         }
 
         const policyID = filteredPolicies.at(0)?.id;
-        const policyExpenseReportID = getPolicyExpenseChat(currentUserAccountID ?? -1, policyID ?? '-1')?.reportID ?? '-1';
+        const policyExpenseReportID = getPolicyExpenseChat(currentUserAccountID, policyID)?.reportID;
         IOU.setMoneyRequestParticipants(transactionID, [
             {
                 selected: true,
                 accountID: 0,
                 isPolicyExpenseChat: true,
                 reportID: policyExpenseReportID,
-                policyID: policyID ?? '-1',
+                policyID,
                 searchText: activePolicy?.name,
             },
         ]);
-        Navigation.navigate(ROUTES.MONEY_REQUEST_STEP_CATEGORY.getRoute(actionName, CONST.IOU.TYPE.SUBMIT, transactionID, policyExpenseReportID));
+        if (policyExpenseReportID) {
+            Navigation.navigate(ROUTES.MONEY_REQUEST_STEP_CATEGORY.getRoute(actionName, CONST.IOU.TYPE.SUBMIT, transactionID, policyExpenseReportID));
+        } else {
+            Log.warn('policyExpenseReportID is not valid during expense categorizing');
+        }
         return;
     }
 
@@ -8520,7 +8546,7 @@ function getApprovalChain(policy: OnyxEntry<Policy>, expenseReport: OnyxEntry<Re
     const approvalChain: string[] = [];
     const fullApprovalChain: string[] = [];
     const reportTotal = expenseReport?.total ?? 0;
-    const submitterEmail = PersonalDetailsUtils.getLoginsByAccountIDs([expenseReport?.ownerAccountID ?? -1]).at(0) ?? '';
+    const submitterEmail = PersonalDetailsUtils.getLoginsByAccountIDs([expenseReport?.ownerAccountID ?? CONST.DEFAULT_NUMBER_ID]).at(0) ?? '';
 
     if (PolicyUtils.isSubmitAndClose(policy)) {
         return approvalChain;
@@ -8558,7 +8584,7 @@ function getApprovalChain(policy: OnyxEntry<Policy>, expenseReport: OnyxEntry<Re
 /**
  * Checks if the user has missing bank account for the invoice room.
  */
-function hasMissingInvoiceBankAccount(iouReportID: string): boolean {
+function hasMissingInvoiceBankAccount(iouReportID: string | undefined): boolean {
     const invoiceReport = getReport(iouReportID);
 
     if (!isInvoiceReport(invoiceReport)) {
@@ -8573,8 +8599,8 @@ function hasInvoiceReports() {
     return reports.some((report) => isInvoiceReport(report));
 }
 
-function getReportMetadata(reportID?: string) {
-    return allReportMetadataKeyValue[reportID ?? '-1'];
+function getReportMetadata(reportID: string | undefined) {
+    return reportID ? allReportMetadataKeyValue[reportID] : undefined;
 }
 
 export {
@@ -8687,7 +8713,6 @@ export {
     getLastVisibleMessage,
     getMoneyRequestOptions,
     getMoneyRequestSpendBreakdown,
-    getNewMarkerReportActionID,
     getNonHeldAndFullAmount,
     getOptimisticDataForParentReportAction,
     getOriginalReportID,
diff --git a/src/pages/home/report/PureReportActionItem.tsx b/src/pages/home/report/PureReportActionItem.tsx
index 34dd2a9d1350..bb3e04a90b84 100644
--- a/src/pages/home/report/PureReportActionItem.tsx
+++ b/src/pages/home/report/PureReportActionItem.tsx
@@ -687,7 +687,8 @@ function PureReportActionItem({
                 <RenderHTML html={`<comment>${translate('parentReportAction.deletedReport')}</comment>`} />
             ) : (
                 <ReportPreview
-                    iouReportID={ReportActionsUtils.getIOUReportIDFromReportActionPreview(action)}
+                    // eslint-disable-next-line @typescript-eslint/non-nullable-type-assertion-style
+                    iouReportID={ReportActionsUtils.getIOUReportIDFromReportActionPreview(action) as string}
                     chatReportID={reportID}
                     policyID={report?.policyID ?? '-1'}
                     containerStyles={displayAsGroup ? [] : [styles.mt2]}
diff --git a/tests/actions/EnforceActionExportRestrictions.ts b/tests/actions/EnforceActionExportRestrictions.ts
index bead431d030f..142f1df6f367 100644
--- a/tests/actions/EnforceActionExportRestrictions.ts
+++ b/tests/actions/EnforceActionExportRestrictions.ts
@@ -19,6 +19,11 @@ describe('ReportUtils', () => {
         expect(ReportUtils.getReport).toBeUndefined();
     });
 
+    it('does not export getReportTransactions', () => {
+        // @ts-expect-error the test is asserting that it's undefined, so the TS error is normal
+        expect(ReportUtils.getReportTransactions).toBeUndefined();
+    });
+
     it('does not export isOneTransactionReport', () => {
         // @ts-expect-error the test is asserting that it's undefined, so the TS error is normal
         expect(ReportUtils.isOneTransactionReport).toBeUndefined();