The notifications are shown complete and without problems when using a button to generate them, but when I schedule a task with Workmanager to show the same notification, it is generated but only the title is shown and not the rest of the content which is a data type string obtained from another class. The application It is only for android.

This is the code used for flutter local notification:

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

var variableString = "Notificación de prueba";

  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

  Future<void> initNotifications() async {
    const AndroidInitializationSettings initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');
    const DarwinInitializationSettings initializationSettingsIOS = DarwinInitializationSettings();
    const InitializationSettings initializationSettings = InitializationSettings(android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
    await flutterLocalNotificationsPlugin.initialize(initializationSettings);
  }

  Future<void> showNotificacion() async {
    const AndroidNotificationDetails androidNotificationDetails =
    AndroidNotificationDetails(
      '1', 'My App Name',
      playSound: true,
      importance: Importance.max,
      priority: Priority.max,
      showWhen: true,
      showProgress: true,
      enableVibration: true,
      ongoing: true,
      styleInformation: BigTextStyleInformation(''),
    );

    const NotificationDetails notificationDetails =
    NotificationDetails(android: androidNotificationDetails);

    await flutterLocalNotificationsPlugin.show(
        1, 'My App Name', variableString, notificationDetails);
  }

This is the initialization code of the App:

@pragma('vm:entry-point')
void callbackDispatcher() {
  Workmanager().executeTask((task, inputData) {
    showNotificacion(); // Envía una notificación cada 45 minutos
    return Future.value(true);
  });
}


Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await initNotifications(); // Local Notifications
   await Workmanager().initialize(callbackDispatcher, isInDebugMode: true);
   await Workmanager().registerPeriodicTask(
   "1", "simplePeriodicTask", frequency: Duration(minutes: 45),);
  runApp(
    const MyApp(),
  );
}

I have tried obtaining the value of said variable in different ways (storing it in storage with sharedPreferences, using a global variable, etc…) but I have not been able to get the information to be displayed with flutter local notification through workmanager.

Thank you very much for your time!!