[firebase_messaging:^10.0.4] FirebaseMessaging.instance.getToken() don't work

[gracegyu]

When I use Flutter 1.x, I successfully send push message from node.js server to my flutter app using firebase_messaging:7.0.3
I sent a token to server with below code.

FirebaseMessaging _firebaseMessaging;
_firebaseMessaging.getToken().then((String notiToken) {
// Code to send token to server
});

I migrated my flutter project to v2.x. I had to use firebase_messaging:10.0.4. And I changed my code about firebase_messaging.

    FirebaseMessaging.instance
        .getInitialMessage()
        .then((RemoteMessage? message) {
      if (message != null) {
        // show notification
      }
    });

    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      RemoteNotification? notification = message.notification;
      AndroidNotification? android = message.notification?.android;
      if (notification != null && android != null && !kIsWeb) {
        flutterLocalNotificationsPlugin!.show(
            notification.hashCode,
            notification.title,
            notification.body,
            NotificationDetails(
              android: AndroidNotificationDetails(
                channel!.id,
                channel!.name,
                channel!.description,
                // TODO add a proper drawable resource to android, for now using
                //      one that already exists in example app.
                icon: 'launch_background',
              ),
            ));
      }
    });

    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
      print('A new onMessageOpenedApp event was published!');
       // show notification
    });


    FirebaseMessaging.instance.getToken().then((String? token) {
      print("firebaseMessaging token : $token");
      // Code to send token to server
    });

I have successfully sent the token to the server.
However, when a push notification is sent to node.js using that token, a message does not come as in v1.x.
Is the token wrong? I can't tell if the code is wrong.

Please help.