GroupMemberLabelEditor: Show dialog on save or permissions error

_locales/en/messages.json

@@ -6240,6 +6240,18 @@
     "messageformat": "Saving changes...",
     "description": "Accessibility label for button with spinner as we save the user's member label."
   },
+  "icu:ConversationDetails--member-label--error-title": {
+    "messageformat": "Can’t save member label",
+    "description": "If save of member label failed, a dialog shows. Title of dialog."
+  },
+  "icu:ConversationDetails--member-label--error-generic": {
+    "messageformat": "Check your connection and try again.",
+    "description": "If save of member label failed, a dialog shows. Description of dialog."
+  },
+  "icu:ConversationDetails--member-label--error-permissions": {
+    "messageformat": "Only admins can set member labels in this group.",
+    "description": "If Desktop discovers that permissions have changed since entering the screen, it will show this in an error dialog and exit the pane."
+  },
   "icu:ConversationDetails--disappearing-messages-label": {
     "messageformat": "Disappearing messages",
     "description": "This is the label for the disappearing messages setting panel"

ts/components/conversation/conversation-details/GroupMemberLabelEditor.dom.stories.tsx

@@ -9,6 +9,9 @@ import { GroupMemberLabelEditor } from './GroupMemberLabelEditor.dom.js';
 import { getDefaultConversation } from '../../../test-helpers/getDefaultConversation.std.js';
 import { ThemeType } from '../../../types/Util.std.js';
 import { getFakeBadge } from '../../../test-helpers/getFakeBadge.std.js';
+import { SECOND } from '../../../util/durations/constants.std.js';
+import { sleep } from '../../../util/sleep.std.js';
+import { SignalService as Proto } from '../../../protobuf/index.std.js';
 
 const { i18n } = window.SignalContext;
 
@@ -26,7 +29,14 @@ const createProps = (): PropsType => ({
   ourColor: '160',
   popPanelForConversation: action('popPanelForConversation'),
   theme: ThemeType.light,
-  updateGroupMemberLabel: action('changeHasGroupLink'),
+  updateGroupMemberLabel: async (
+    options,
+    callbacks?: { onSuccess?: () => unknown }
+  ) => {
+    action('updateGroupMemberLabel')(options);
+    await sleep(SECOND);
+    callbacks?.onSuccess?.();
+  },
 });
 
 export function NoExistingLabel(): React.JSX.Element {
@@ -62,3 +72,51 @@ export function WithBadge(): React.JSX.Element {
 
   return <GroupMemberLabelEditor {...props} />;
 }
+
+export function ThrowsErrorOnSave(): React.JSX.Element {
+  const props: PropsType = {
+    ...createProps(),
+    updateGroupMemberLabel: async (
+      options,
+      callbacks?: { onFailure?: () => unknown }
+    ) => {
+      action('updateGroupMemberLabel')(options);
+      await sleep(SECOND);
+      callbacks?.onFailure?.();
+    },
+  };
+
+  return <GroupMemberLabelEditor {...props} />;
+}
+
+export function PermissionsError(): React.JSX.Element {
+  const props: PropsType = createProps();
+
+  return (
+    <GroupMemberLabelEditor
+      {...props}
+      group={{
+        ...props.group,
+        areWeAdmin: false,
+        accessControlAttributes:
+          Proto.AccessControl.AccessRequired.ADMINISTRATOR,
+      }}
+    />
+  );
+}
+
+export function PermissionsRestrictedButAdmin(): React.JSX.Element {
+  const props: PropsType = createProps();
+
+  return (
+    <GroupMemberLabelEditor
+      {...props}
+      group={{
+        ...props.group,
+        areWeAdmin: true,
+        accessControlAttributes:
+          Proto.AccessControl.AccessRequired.ADMINISTRATOR,
+      }}
+    />
+  );
+}

ts/components/conversation/conversation-details/GroupMemberLabelEditor.dom.tsx

@@ -1,7 +1,7 @@
 // Copyright 2026 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-import React, { useRef, useState } from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import { noop } from 'lodash';
 
 import { Input } from '../../Input.dom.js';
@@ -26,6 +26,8 @@ import {
 } from '../Message.dom.js';
 import { ConversationColors } from '../../../types/Colors.std.js';
 import { WidthBreakpoint } from '../../_util.std.js';
+import { AxoAlertDialog } from '../../../axo/AxoAlertDialog.dom.js';
+import { SignalService as Proto } from '../../../protobuf/index.std.js';
 
 import type { EmojiVariantKey } from '../../fun/data/emojis.std.js';
 import type {
@@ -71,6 +73,11 @@ export function GroupMemberLabelEditor({
   theme,
   updateGroupMemberLabel,
 }: PropsType): React.JSX.Element {
+  const [isShowingGeneralError, setIsShowingGeneralError] =
+    React.useState(false);
+  const [isShowingPermissionsError, setIsShowingPermissionsError] =
+    React.useState(false);
+
   const messageContainer = useRef<HTMLDivElement | null>(null);
 
   const [labelEmoji, setLabelEmoji] = useState(existingLabelEmoji);
@@ -94,6 +101,17 @@ export function GroupMemberLabelEditor({
     ? { labelEmoji, labelString: labelString.trim() }
     : undefined;
 
+  useEffect(() => {
+    if (
+      !group.areWeAdmin &&
+      group.accessControlAttributes ===
+        Proto.AccessControl.AccessRequired.ADMINISTRATOR &&
+      !isShowingPermissionsError
+    ) {
+      setIsShowingPermissionsError(true);
+    }
+  }, [group, isShowingPermissionsError, setIsShowingPermissionsError]);
+
   return (
     <div className={tw('mx-auto flex h-full max-w-[640px] flex-col')}>
       <div>
@@ -245,7 +263,8 @@ export function GroupMemberLabelEditor({
                   popPanelForConversation();
                 },
                 onFailure() {
-                  // TODO: DESKTOP-9710
+                  setIsSaving(false);
+                  setIsShowingGeneralError(true);
                 },
               }
             );
@@ -254,6 +273,68 @@ export function GroupMemberLabelEditor({
           {i18n('icu:save')}
         </AxoButton.Root>
       </div>
+      <AxoAlertDialog.Root
+        open={isShowingGeneralError}
+        onOpenChange={value => {
+          if (!value) {
+            setIsShowingGeneralError(false);
+          }
+        }}
+      >
+        <AxoAlertDialog.Content escape="cancel-is-noop">
+          <AxoAlertDialog.Body>
+            <AxoAlertDialog.Title>
+              {i18n('icu:ConversationDetails--member-label--error-title')}
+            </AxoAlertDialog.Title>
+            <AxoAlertDialog.Description>
+              {i18n('icu:ConversationDetails--member-label--error-generic')}
+            </AxoAlertDialog.Description>
+          </AxoAlertDialog.Body>
+          <AxoAlertDialog.Footer>
+            <AxoAlertDialog.Action
+              variant="primary"
+              arrow={false}
+              onClick={() => {
+                setIsShowingGeneralError(false);
+              }}
+            >
+              {i18n('icu:ok')}
+            </AxoAlertDialog.Action>
+          </AxoAlertDialog.Footer>
+        </AxoAlertDialog.Content>
+      </AxoAlertDialog.Root>
+      <AxoAlertDialog.Root
+        open={isShowingPermissionsError}
+        onOpenChange={value => {
+          if (!value) {
+            setIsShowingPermissionsError(false);
+            popPanelForConversation();
+          }
+        }}
+      >
+        <AxoAlertDialog.Content escape="cancel-is-noop">
+          <AxoAlertDialog.Body>
+            <AxoAlertDialog.Title>
+              {i18n('icu:ConversationDetails--member-label--error-title')}
+            </AxoAlertDialog.Title>
+            <AxoAlertDialog.Description>
+              {i18n('icu:ConversationDetails--member-label--error-permissions')}
+            </AxoAlertDialog.Description>
+          </AxoAlertDialog.Body>
+          <AxoAlertDialog.Footer>
+            <AxoAlertDialog.Action
+              variant="primary"
+              arrow={false}
+              onClick={() => {
+                popPanelForConversation();
+                setIsShowingPermissionsError(false);
+              }}
+            >
+              {i18n('icu:ok')}
+            </AxoAlertDialog.Action>
+          </AxoAlertDialog.Footer>
+        </AxoAlertDialog.Content>
+      </AxoAlertDialog.Root>
     </div>
   );
 }