diff --git a/lib/hooks/relationship-hooks.js b/lib/hooks/relationship-hooks.js
--- a/lib/hooks/relationship-hooks.js
+++ b/lib/hooks/relationship-hooks.js
@@ -4,7 +4,7 @@
 import uuid from 'uuid';
 
 import { useNewThickThread } from './thread-hooks.js';
-import { useFindUserIdentities } from '../actions/find-user-identities-actions.js';
+import { useUsersSupportThickThreads } from './user-identities-hooks.js';
 import { updateRelationships as serverUpdateRelationships } from '../actions/relationship-actions.js';
 import { useLegacyAshoatKeyserverCall } from '../keyserver-conn/legacy-keyserver-call.js';
 import { pendingToRealizedThreadIDsSelector } from '../selectors/thread-selectors.js';
@@ -87,7 +87,7 @@
   );
   const createNewThickThread = useNewThickThread();
 
-  const findUserIdentities = useFindUserIdentities();
+  const filterUsersSupportingThickThreads = useUsersSupportThickThreads();
 
   const updateRelationshipsAndSendRobotext = React.useCallback(
     async (action: RelationshipAction, userIDs: $ReadOnlyArray<string>) => {
@@ -97,10 +97,11 @@
         );
         return {};
       }
-      const { identities } = await findUserIdentities(userIDs);
+      const usersSupportingThickThreads =
+        await filterUsersSupportingThickThreads(userIDs);
       const planForUsers = new Map<string, RobotextPlanForUser>();
       for (const userID of userIDs) {
-        if (!identities[userID]) {
+        if (!usersSupportingThickThreads.has(userID)) {
           planForUsers.set(userID, { plan: 'send_to_thin_thread' });
           continue;
         }
@@ -219,7 +220,7 @@
     [
       viewerID,
       updateRelationships,
-      findUserIdentities,
+      filterUsersSupportingThickThreads,
       pendingToRealizedThreadIDs,
       sendRobotextToThickThread,
       userInfos,