diff --git a/lib/shared/search-utils.js b/lib/shared/search-utils.js
--- a/lib/shared/search-utils.js
+++ b/lib/shared/search-utils.js
@@ -18,11 +18,16 @@
 import { threadPermissions } from '../types/thread-permission-types.js';
 import { type ThreadType, threadTypes } from '../types/thread-types-enum.js';
 import { type ThreadInfo } from '../types/thread-types.js';
-import type { AccountUserInfo, UserListItem } from '../types/user-types.js';
+import type {
+  AccountUserInfo,
+  UserListItem,
+  GlobalAccountUserInfo,
+} from '../types/user-types.js';
 import {
   useServerCall,
   useDispatchActionPromise,
 } from '../utils/action-utils.js';
+import { values } from '../utils/objects.js';
 
 const notFriendNotice = 'not friend';
 
@@ -31,6 +36,7 @@
   userInfos: { +[id: string]: AccountUserInfo },
   searchIndex: SearchIndex,
   excludeUserIDs: $ReadOnlyArray<string>,
+  includeServerSearchUsers: ?$ReadOnlyArray<GlobalAccountUserInfo>,
   inputParentThreadInfo: ?ThreadInfo,
   inputCommunityThreadInfo: ?ThreadInfo,
   threadType: ?ThreadType,
@@ -55,10 +61,18 @@
     containingThreadInfo = communityThreadInfo;
   }
 
-  let results = [];
-  const appendUserInfo = (userInfo: AccountUserInfo) => {
+  const results: {
+    [id: string]: {
+      ...AccountUserInfo | GlobalAccountUserInfo,
+      isMemberOfParentThread: boolean,
+      isMemberOfContainingThread: boolean,
+    },
+  } = {};
+  const appendUserInfo = (
+    userInfo: AccountUserInfo | GlobalAccountUserInfo,
+  ) => {
     const { id } = userInfo;
-    if (excludeUserIDs.includes(id)) {
+    if (excludeUserIDs.includes(id) || id in results) {
       return;
     }
     if (
@@ -71,11 +85,11 @@
     ) {
       return;
     }
-    results.push({
+    results[id] = {
       ...userInfo,
       isMemberOfParentThread: userIsMember(parentThreadInfo, id),
       isMemberOfContainingThread: userIsMember(containingThreadInfo, id),
-    });
+    };
   };
   if (text === '') {
     for (const id in userInfos) {
@@ -88,14 +102,21 @@
     }
   }
 
+  if (includeServerSearchUsers) {
+    for (const userInfo of includeServerSearchUsers) {
+      appendUserInfo(userInfo);
+    }
+  }
+
   const blockedRelationshipsStatuses = new Set([
     userRelationshipStatus.BLOCKED_BY_VIEWER,
     userRelationshipStatus.BLOCKED_VIEWER,
     userRelationshipStatus.BOTH_BLOCKED,
   ]);
 
+  let userResults = values(results);
   if (text === '') {
-    results = results.filter(userInfo =>
+    userResults = userResults.filter(userInfo =>
       containingThreadInfo
         ? userInfo.isMemberOfContainingThread &&
           !blockedRelationshipsStatuses.has(userInfo.relationshipStatus)
@@ -109,7 +130,7 @@
   const containingThreadMembers = [];
   const parentThreadMembers = [];
 
-  for (const userResult of results) {
+  for (const userResult of userResults) {
     const relationshipStatus = userResult.relationshipStatus;
     if (blockedRelationshipsStatuses.has(relationshipStatus)) {
       blockedUsers.push(userResult);
diff --git a/native/chat/compose-subchannel.react.js b/native/chat/compose-subchannel.react.js
--- a/native/chat/compose-subchannel.react.js
+++ b/native/chat/compose-subchannel.react.js
@@ -203,6 +203,7 @@
         otherUserInfos,
         userSearchIndex,
         userInfoInputIDs,
+        [],
         parentThreadInfo,
         communityThreadInfo,
         threadType,
diff --git a/native/chat/settings/add-users-modal.react.js b/native/chat/settings/add-users-modal.react.js
--- a/native/chat/settings/add-users-modal.react.js
+++ b/native/chat/settings/add-users-modal.react.js
@@ -176,6 +176,7 @@
         otherUserInfos,
         userSearchIndex,
         excludeUserIDs,
+        [],
         parentThreadInfo,
         communityThreadInfo,
         threadInfo.type,
diff --git a/web/modals/threads/members/add-members-modal.react.js b/web/modals/threads/members/add-members-modal.react.js
--- a/web/modals/threads/members/add-members-modal.react.js
+++ b/web/modals/threads/members/add-members-modal.react.js
@@ -64,6 +64,7 @@
         otherUserInfos,
         userSearchIndex,
         excludeUserIDs,
+        [],
         parentThreadInfo,
         communityThreadInfo,
         threadInfo.type,