I can’t push notifications with my api express js to my device (android & ios)

I read all the documentation about https://firebase.google.com/docs/cloud-messaging/migrate-v1 and some others documentation talking about it.

I followed these instructions to get simple notifications: https://firebase.google.com/codelabs/firebase-fcm-flutter#0

I created a service account for my app and fcm by following theses instructions:
https://help.emarsys.com/hc/en-us/articles/18224997987602-Android-integration-Creating-a-Google-service-account-to-enable-push-notifications

Before the migrations, my notifications were working.
I tried to update it but it bug.

API

• version: v20.11.1

packages:

• “firebase-admin”: “^11.0.0”,
• “google-auth-library”: “^8.9.0”,

Flutter

• version: 3.22.3

packages:

• firebase_core: ^2.32.0
• firebase_analytics: ^10.10.7
• firebase_messaging: ^14.9.4

Flutter:

class TestFCM {
  static void init() async {
    final messaging = FirebaseMessaging.instance;

    final settings = await messaging.requestPermission(
      alert: true,
      announcement: false,
      badge: true,
      carPlay: false,
      criticalAlert: false,
      provisional: false,
      sound: true,
    );

    if (kDebugMode) {
      print('Permission granted: ${settings.authorizationStatus}');
    }
    String? token = await messaging.getToken();
    print('token = $token');
  }
}

I print token to get it and test in my api like so:

API:

const { GoogleAuth } = require('google-auth-library');

const FLUTTER_NOTIFICATION_CLICK = 'FLUTTER_NOTIFICATION_CLICK';

//Here i put my serviceAccountPath
const serviceAccountPath = '';

const auth = new GoogleAuth({
  keyFilename: serviceAccountPath,
  scopes: ['https://www.googleapis.com/auth/firebase.messaging'],
});

const getAccessToken = async () => {
  const client = await auth.getClient();
  const token = await client.getAccessToken();
  return token.token;
};

const admin = require('firebase-admin');

admin.initializeApp({
  credential: admin.credential.applicationDefault(),
  databaseURL: process.env.databaseURL,
});

const sendMessage = async (message) => {
  const accessToken = await getAccessToken();

  try {
    const response = await fetch(
      'https://fcm.googleapis.com/v1/projects/odopassdb-test/messages:send',
      {
        method: 'POST',
        headers: {
          Authorization: `Bearer ${accessToken}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ message }),
      },
    );

    const responseData = await response.json();
    console.log('response data', responseData);
    console.log('response details', JSON.stringify(responseData.error.details));
    return responseData;
  } catch (error) {
    console.error('error notification', error);
  }
};

// Here i put my fcmToken getted from the app
const fcmToken = '';

const message = {
  data: {
    title: 'title',
    body: 'body',
    click_action: FLUTTER_NOTIFICATION_CLICK,
    screen: '',
  },
  token: fcmToken,
};

sendMessage(message);

In commented section i enter my value.
I generated the serviceAccount via firebase. I verified senderId, it is correct.
However it failed and return this error:

response data {
  error: {
    code: 403,
    message: 'SenderId mismatch',
    status: 'PERMISSION_DENIED',
    details: [ [Object] ]
  }
}
response details [{"@type":"type.googleapis.com/google.firebase.fcm.v1.FcmError","errorCode":"SENDER_ID_MISMATCH"}]

The API V1 on firebase is enabled:
Firebase Cloud Messaging API (V1)Enabled

Also the legacy is enabled but it looks like i cannot disabled this, and if it use it, it say deprecrated endpoint (when i was using old package of firebase messaging) so it shouldn’t be the error.

How can i resolve it please ?

Have a nice day!

• Use API V1 to test
• Recreate an account with https://help.emarsys.com/hc/en-us/articles/18224997987602-Android-integration-Creating-a-Google-service-account-to-enable-push-notifications but it didn’t changed the serviceAccount key.