diff --git a/src/App.js b/src/App.js
index 3e8f0a45b..9f3044c17 100644
--- a/src/App.js
+++ b/src/App.js
@@ -32,7 +32,7 @@ export default class StripesCore extends Component {
     this.store = configureStore(initialState, this.logger, this.epics);
     this.actionNames = gatherActions();
 
-    registerServiceWorker(okapiConfig.url, this.logger);
+    registerServiceWorker(okapiConfig, this.logger);
   }
 
   componentWillUnmount() {
diff --git a/src/service-worker.js b/src/service-worker.js
index 62df2c97e..21b51f25c 100644
--- a/src/service-worker.js
+++ b/src/service-worker.js
@@ -8,6 +8,8 @@ let tokenExpiration = null;
 /** string FQDN including protocol, e.g. https://some-okapi.somewhere.org */
 let okapiUrl = null;
 
+let okapiTenant = null;
+
 /** categorical logger object */
 let logger = null;
 
@@ -109,6 +111,10 @@ const rtr = async (event) => {
 
   isRotating = true;
   return fetch(`${okapiUrl}/authn/refresh`, {
+    headers: {
+      'content-type': 'application/json',
+      'x-okapi-tenant': okapiTenant,
+    },
     method: 'POST',
     credentials: 'include',
     mode: 'cors',
@@ -332,14 +338,14 @@ self.addEventListener('activate', async (event) => {
 
 /**
  * eventListener: message
- * listen for messages from clients and dispatch them accordingly.
- * OKAPI_URL: store
+ * listen for messages from @folio/stripes-core clients and dispatch them accordingly.
  */
 self.addEventListener('message', async (event) => {
   if (event.data.source === '@folio/stripes-core') {
     console.info('-- (rtr-sw) reading', event.data);
-    if (event.data.type === 'OKAPI_URL') {
-      okapiUrl = event.data.value;
+    if (event.data.type === 'OKAPI_CONFIG') {
+      okapiUrl = event.data.value.url;
+      okapiTenant = event.data.value.tenant;
     }
 
     if (event.data.type === 'LOGGER') {
diff --git a/src/serviceWorkerRegistration.js b/src/serviceWorkerRegistration.js
index 07085b9e3..b29e6e8af 100644
--- a/src/serviceWorkerRegistration.js
+++ b/src/serviceWorkerRegistration.js
@@ -10,11 +10,11 @@
  * immediately claims control. Otherwise, no RTR would occur until after a
  * reload.
  *
- * @param {string} okapiUrl
+ * @param {object} okapi config object
  * @param {function} callback function to call when receiving any message
  * @return void
  */
-export const registerServiceWorker = async (okapiUrl, logger) => {
+export const registerServiceWorker = async (okapiConfig, logger) => {
   if ('serviceWorker' in navigator) {
     try {
       let sw = null;
@@ -42,7 +42,7 @@ export const registerServiceWorker = async (okapiUrl, logger) => {
       //
       if (sw) {
         logger.log('rtr', '<= sending OKAPI_URL', sw);
-        sw.postMessage({ source: '@folio/stripes-core', type: 'OKAPI_URL', value: okapiUrl });
+        sw.postMessage({ source: '@folio/stripes-core', type: 'OKAPI_CONFIG', value: okapiConfig });
         logger.log('rtr', '<= sending LOGGER');
         sw.postMessage({ source: '@folio/stripes-core', type: 'LOGGER', value: logger });
       } else {