diff --git a/src/formio/components/cosign.ts b/src/formio/components/cosign.ts
index 99ece67..850683e 100644
--- a/src/formio/components/cosign.ts
+++ b/src/formio/components/cosign.ts
@@ -43,7 +43,7 @@ export interface CosignV1ComponentSchema extends Omit<CosignV1InputSchema, KeysT
   authPlugin: string; // plugin identifiers in the backend are dynamic
 }
 
-type V2KeysToOmit = 'hideLabel' | 'disabled' | 'placeholder';
+type V2KeysToOmit = 'hideLabel' | 'disabled' | 'placeholder' | 'registration';
 
 /**
  * The cosign component type, otherwise known as 'Cosign'.
diff --git a/test-d/formio/components/cosign-v2.test-d.ts b/test-d/formio/components/cosign-v2.test-d.ts
index 9e699b9..acc2e68 100644
--- a/test-d/formio/components/cosign-v2.test-d.ts
+++ b/test-d/formio/components/cosign-v2.test-d.ts
@@ -51,10 +51,6 @@ expectAssignable<CosignV2ComponentSchema>({
     // translatedErrors is converted into errors by the backend
     required: 'Je moet een waarde opgeven!!!',
   },
-  // registration tab in builder form
-  registration: {
-    attribute: '',
-  },
   // translations tab in builder form
   openForms: {
     translations: {
@@ -114,3 +110,16 @@ expectNotAssignable<CosignV2ComponentSchema>({
   authPlugin: 'digid',
   confirmationRecipient: true,
 });
+
+// registration attributes are not supported
+expectNotAssignable<CosignV2ComponentSchema>({
+  id: 'yejak',
+  type: 'cosign' as const,
+  validateOn: 'blur' as const,
+  key: 'someCoSign',
+  label: 'Some cosign',
+  authPlugin: 'digid',
+  registration: {
+    attribute: 'foo',
+  },
+});