diff --git a/lib/shared/session-utils.js b/lib/shared/session-utils.js
--- a/lib/shared/session-utils.js
+++ b/lib/shared/session-utils.js
@@ -11,7 +11,10 @@
   type LogInActionSource,
 } from '../types/account-types.js';
 import type { AppState } from '../types/redux-types.js';
-import type { PreRequestUserState } from '../types/session-types.js';
+import type {
+  PreRequestUserState,
+  IdentityCallPreRequestUserState,
+} from '../types/session-types.js';
 import type { CurrentUserInfo } from '../types/user-types.js';
 
 function invalidSessionDowngrade(
@@ -44,6 +47,33 @@
   );
 }
 
+function identityInvalidSessionDowngrade(
+  currentReduxState: AppState,
+  actionCurrentUserInfo: ?CurrentUserInfo,
+  preRequestUserState: ?IdentityCallPreRequestUserState,
+): boolean {
+  // If this action represents a session downgrade - oldState has a loggedIn
+  // currentUserInfo, but the action has an anonymous one - then it is only
+  // valid if the currentUserInfo used for the request matches what oldState
+  // currently has. If the currentUserInfo in Redux has changed since the
+  // request, and is currently loggedIn, then the session downgrade does not
+  // apply to it. In this case we will simply swallow the action.
+  const currentCurrentUserInfo = currentReduxState.currentUserInfo;
+  return !!(
+    currentCurrentUserInfo &&
+    !currentCurrentUserInfo.anonymous &&
+    // Note that an undefined actionCurrentUserInfo represents an action that
+    // doesn't affect currentUserInfo, whereas a null one represents an action
+    // that sets it to null
+    (actionCurrentUserInfo === null ||
+      (actionCurrentUserInfo && actionCurrentUserInfo.anonymous)) &&
+    preRequestUserState &&
+    (preRequestUserState.currentUserInfo?.id !== currentCurrentUserInfo.id ||
+      preRequestUserState.commServicesAccessToken !==
+        currentReduxState.commServicesAccessToken)
+  );
+}
+
 function invalidSessionRecovery(
   currentReduxState: AppState,
   actionCurrentUserInfo: ?CurrentUserInfo,
@@ -68,4 +98,8 @@
   );
 }
 
-export { invalidSessionDowngrade, invalidSessionRecovery };
+export {
+  invalidSessionDowngrade,
+  identityInvalidSessionDowngrade,
+  invalidSessionRecovery,
+};
diff --git a/lib/types/session-types.js b/lib/types/session-types.js
--- a/lib/types/session-types.js
+++ b/lib/types/session-types.js
@@ -77,6 +77,11 @@
   },
 };
 
+export type IdentityCallPreRequestUserState = $ReadOnly<{
+  ...PreRequestUserState,
+  +commServicesAccessToken: ?string,
+}>;
+
 export type SetSessionPayload = {
   +sessionChange: ClientSessionChange,
   +preRequestUserState: ?PreRequestUserState,