Flutter – Local notifications are not received

I use the flutter_local_notifications package for local notifications, but when I create a local notification I have no errors, but the notification does not arrive on iOS even though I have enabled permission to receive notifications. What could be the reason for not receiving notifications?

local notification

static final FlutterLocalNotificationsPlugin _localNotificationPlugin =
      FlutterLocalNotificationsPlugin();

  Future<void> initialize() async {
    const AndroidInitializationSettings androidInit =
        AndroidInitializationSettings('notify_icon');
    DarwinInitializationSettings iosInit = DarwinInitializationSettings(
      requestSoundPermission: false,
      requestBadgePermission: false,
      requestAlertPermission: false,
      onDidReceiveLocalNotification: (id, title, body, payload) => null,
    );

    InitializationSettings initSettings = InitializationSettings(
      android: androidInit,
      iOS: iosInit,
    );

    await _localNotificationPlugin.initialize(initSettings);
  }

  // to show periodic notification at regular interval
  Future showPeriodicNotifications({
    required String title,
    required String body,
    required String payload,
    required int timestamp,
  }) async {
    final NotificationDetails details = await _notificationDetails();

    await _localNotificationPlugin.periodicallyShow(
      1,
      title,
      body,
      RepeatInterval.everyMinute,
      details,
      payload: payload,
    );
  }

  // to schedule a local notification
  Future showScheduleNotification({
    required String title,
    required String body,
    required String payload,
    required int timestamp,
  }) async {
    final NotificationDetails details = await _notificationDetails();
    DateTime now = DateTime.now();

    tz.initializeTimeZones();
    await _localNotificationPlugin.zonedSchedule(
      0,
      title,
      body,
      // tz.TZDateTime.now(tz.local).add(const Duration(seconds: 10)),
      tz.TZDateTime(
        tz.local,
        now.year,
        now.month,
        now.day,
        now.hour,
        now.minute,
        now.second,
      ).add(const Duration(seconds: 5)),
      details,
      androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
      uiLocalNotificationDateInterpretation:
          UILocalNotificationDateInterpretation.absoluteTime,
      payload: payload,
    );

    print(
      tz.TZDateTime(
        tz.local,
        now.year,
        now.month,
        now.day,
        now.hour,
        now.minute,
        now.second,
      ).add(const Duration(seconds: 10)),
    );
  }

  Future<NotificationDetails> _notificationDetails() async {
    const AndroidNotificationDetails androidNotificationDetails =
        AndroidNotificationDetails(
      'channel_id',
      'channel_name',
      channelDescription: 'description',
      importance: Importance.max,
      priority: Priority.max,
    );

    const DarwinNotificationDetails iosNotificationDetails =
        DarwinNotificationDetails(
      presentAlert: true,
      presentBadge: true,
      presentSound: true,
    );

    return const NotificationDetails(
      android: androidNotificationDetails,
      iOS: iosNotificationDetails,
    );
  }