diff --git a/web/settings/relationship/add-users-list-modal.react.js b/web/settings/relationship/add-users-list-modal.react.js
--- a/web/settings/relationship/add-users-list-modal.react.js
+++ b/web/settings/relationship/add-users-list-modal.react.js
@@ -45,6 +45,10 @@
     relationshipAction,
   } = props;
 
+  const [pendingUsersToAdd, setPendingUsersToAdd] = React.useState<
+    $ReadOnlySet<string>,
+  >(new Set());
+
   const [errorMessage, setErrorMessage] = React.useState('');
 
   const addUsersListChildGenerator = React.useCallback(
@@ -52,10 +56,12 @@
       <AddUsersList
         searchText={searchText}
         excludedStatuses={excludedStatuses}
+        pendingUsersToAdd={pendingUsersToAdd}
+        setPendingUsersToAdd={setPendingUsersToAdd}
         errorMessage={errorMessage}
       />
     ),
-    [excludedStatuses, errorMessage],
+    [excludedStatuses, pendingUsersToAdd, errorMessage],
   );
 
   const callUpdateRelationships =
@@ -68,7 +74,7 @@
       setErrorMessage('');
       const result = await callUpdateRelationships({
         action: relationshipAction,
-        userIDs: [], // TODO: re-add pending users
+        userIDs: Array.from(pendingUsersToAdd),
       });
       closeModal();
       return result;
@@ -76,7 +82,12 @@
       setErrorMessage('unknown error');
       throw e;
     }
-  }, [callUpdateRelationships, closeModal, relationshipAction]);
+  }, [
+    callUpdateRelationships,
+    relationshipAction,
+    pendingUsersToAdd,
+    closeModal,
+  ]);
 
   const confirmSelection = React.useCallback(
     () =>
@@ -104,8 +115,7 @@
     return (
       <Button
         onClick={confirmSelection}
-        // TODO: re-add 0 users check
-        disabled={true || loadingStatus === 'loading'}
+        disabled={pendingUsersToAdd.size === 0 || loadingStatus === 'loading'}
         variant="filled"
         buttonColor={confirmButtonColor}
       >
@@ -117,6 +127,7 @@
     confirmButtonContent,
     confirmSelection,
     loadingStatus,
+    pendingUsersToAdd.size,
   ]);
 
   return (
diff --git a/web/settings/relationship/add-users-list.react.js b/web/settings/relationship/add-users-list.react.js
--- a/web/settings/relationship/add-users-list.react.js
+++ b/web/settings/relationship/add-users-list.react.js
@@ -5,6 +5,7 @@
 import { useENSNames } from 'lib/hooks/ens-cache.js';
 import { useUserSearchIndex } from 'lib/selectors/nav-selectors.js';
 import { useSearchUsers } from 'lib/shared/search-utils.js';
+import type { SetState } from 'lib/types/hook-types.js';
 import type { UserRelationshipStatus } from 'lib/types/relationship-types.js';
 import type {
   GlobalAccountUserInfo,
@@ -19,11 +20,19 @@
 type Props = {
   +searchText: string,
   +excludedStatuses?: $ReadOnlySet<UserRelationshipStatus>,
+  +pendingUsersToAdd: $ReadOnlySet<string>,
+  +setPendingUsersToAdd: SetState<$ReadOnlySet<string>>,
   +errorMessage: string,
 };
 
 function AddUsersList(props: Props): React.Node {
-  const { searchText, excludedStatuses = new Set(), errorMessage } = props;
+  const {
+    searchText,
+    excludedStatuses = new Set(),
+    pendingUsersToAdd,
+    setPendingUsersToAdd,
+    errorMessage,
+  } = props;
 
   const viewerID = useSelector(state => state.currentUserInfo?.id);
   const userInfos = useSelector(state => state.userStore.userInfos);
@@ -82,10 +91,6 @@
     [excludedStatuses, mergedUserInfos, viewerID],
   );
 
-  const [pendingUsersToAdd, setPendingUsersToAdd] = React.useState<
-    $ReadOnlySet<string>,
-  >(new Set());
-
   const toggleUser = React.useCallback(
     (userID: string) => {
       setPendingUsersToAdd(pendingUsers => {