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
@@ -2,6 +2,10 @@
 
 import * as React from 'react';
 
+import {
+  setAuxUserFIDsActionType,
+  clearAuxUserFIDsActionType,
+} from '../actions/aux-user-actions.js';
 import {
   updateRelationships as serverUpdateRelationships,
   updateRelationshipsActionTypes,
@@ -14,7 +18,7 @@
 import { authoritativeKeyserverID } from '../utils/authoritative-keyserver.js';
 import { useCurrentUserFID } from '../utils/farcaster-utils.js';
 import { useDispatchActionPromise } from '../utils/redux-promise-utils.js';
-import { useSelector } from '../utils/redux-utils.js';
+import { useSelector, useDispatch } from '../utils/redux-utils.js';
 import { usingCommServicesAccessToken } from '../utils/services-utils.js';
 
 function FarcasterDataHandler(): React.Node {
@@ -30,7 +34,10 @@
   const identityServiceClient = React.useContext(IdentityClientContext);
   const getFarcasterUsers =
     identityServiceClient?.identityClient.getFarcasterUsers;
+  const findUserIdentities =
+    identityServiceClient?.identityClient.findUserIdentities;
 
+  const dispatch = useDispatch();
   const dispatchActionPromise = useDispatchActionPromise();
   const updateRelationships = useLegacyAshoatKeyserverCall(
     serverUpdateRelationships,
@@ -66,6 +73,7 @@
       !fid ||
       !neynarClient ||
       !getFarcasterUsers ||
+      !findUserIdentities ||
       !currentUserID
     ) {
       return;
@@ -99,6 +107,30 @@
           userIDsToFIDIncludingCurrentUser,
         ),
       );
+      const userStoreIDs = Object.keys(userInfos);
+
+      const userIdentities = await findUserIdentities(userStoreIDs);
+
+      const userStoreFarcasterUsers = Object.entries(userIdentities)
+        .filter(([, identity]) => identity.farcasterId !== null)
+        .map(([userID, identity]) => {
+          return {
+            userID,
+            username: identity.username,
+            farcasterID: identity.farcasterId,
+          };
+        });
+
+      dispatch({
+        type: clearAuxUserFIDsActionType,
+      });
+
+      dispatch({
+        type: setAuxUserFIDsActionType,
+        payload: {
+          farcasterUsers: userStoreFarcasterUsers,
+        },
+      });
     })();
   }, [
     isActive,
@@ -108,6 +140,8 @@
     getFarcasterUsers,
     userInfos,
     dispatchActionPromise,
+    dispatch,
+    findUserIdentities,
     createThreadsAndRobotextForFarcasterMutuals,
     currentUserID,
   ]);