diff --git a/lib/components/farcaster-data-handler.react.js b/lib/components/farcaster-data-handler.react.js
--- a/lib/components/farcaster-data-handler.react.js
+++ b/lib/components/farcaster-data-handler.react.js
@@ -14,7 +14,7 @@
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import { relationshipActions } from '../types/relationship-types.js';
 import { syncedMetadataNames } from '../types/synced-metadata-types.js';
-import { useCurrentUserFID } from '../utils/farcaster-utils.js';
+import { useCurrentUserFID, useUnlinkFID } from '../utils/farcaster-utils.js';
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
 import { useSelector, useDispatch } from '../utils/redux-utils.js';
 import { usingCommServicesAccessToken } from '../utils/services-utils.js';
@@ -52,6 +52,8 @@
 
   const fid = useCurrentUserFID();
 
+  const unlinkFID = useUnlinkFID();
+
   const prevCanQueryRef = React.useRef<?boolean>();
 
   const handleFarcasterMutuals = React.useCallback(async () => {
@@ -135,7 +137,7 @@
   }, [loggedIn, isActive, findUserIdentities, userInfos, dispatch]);
 
   const prevCanQueryHandleCurrentUserFIDRef = React.useRef<?boolean>();
-  const canQueryHandleCurrentUserFID = isActive && !fid && loggedIn;
+  const canQueryHandleCurrentUserFID = isActive && loggedIn;
 
   const handleCurrentUserFID = React.useCallback(async () => {
     if (
@@ -149,11 +151,24 @@
     if (
       !canQueryHandleCurrentUserFID ||
       !findUserIdentities ||
-      !currentUserID
+      !currentUserID ||
+      !neynarClient
     ) {
       return;
     }
 
+    if (fid) {
+      const isCurrentUserFIDValid =
+        await neynarClient.checkIfCurrentUserFIDIsValid(fid);
+
+      if (!isCurrentUserFIDValid) {
+        await unlinkFID();
+        return;
+      }
+
+      return;
+    }
+
     const currentUserIdentityObj = await findUserIdentities([currentUserID]);
     const identityFID = currentUserIdentityObj[currentUserID]?.farcasterID;
 
@@ -170,6 +185,9 @@
     canQueryHandleCurrentUserFID,
     findUserIdentities,
     currentUserID,
+    neynarClient,
+    fid,
+    unlinkFID,
     dispatch,
   ]);
 
diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
--- a/lib/utils/neynar-client.js
+++ b/lib/utils/neynar-client.js
@@ -308,6 +308,28 @@
       throw error;
     }
   }
+
+  async checkIfCurrentUserFIDIsValid(fid: string): Promise<boolean> {
+    const url = getNeynarURL('2', 'user/bulk', { fids: fid });
+
+    try {
+      const response = await fetch(url, {
+        method: 'GET',
+        headers: {
+          Accept: 'application/json',
+          api_key: this.apiKey,
+        },
+      });
+
+      return response.ok;
+    } catch (error) {
+      console.log(
+        'Failed to check if current user FID is valid:',
+        getMessageForException(error) ?? 'unknown',
+      );
+      throw error;
+    }
+  }
 }
 
 export { NeynarClient };