Firebase push Notification Error: ⚠️ Auth error from APNS or Web Push Service

When Push Notification from Nodejs Express server by firebase -admin.

Your Error::

(node:internal/process/task_queues:95:5) {

  errorInfo: {

    code: 'messaging/third-party-auth-error',

    message: 'Auth error from APNS or Web Push Service'

  },

  codePrefix: 'messaging'

}

Old Code::

import * as admin from 'firebase-admin';

// import path from 'path';

import ApiError from '../../../errors/ApiError';

import httpStatus from 'http-status';

import config from '../../../config';

admin.initializeApp({

  credential: admin.credential.cert(

    // path.join(

    //   __dirname,

    //   './jornee-66109-firebase-adminsdk-tf0wd-f34c47323d.json',

    // ),

    firebaseConfig as any,

  ),

});

type NotificationPayload = {

  title: string;

  body: string;

  data?: { [key: string]: string };

};

export const sendNotification = async (

  fcmToken: string,

  payload: NotificationPayload,

): Promise<any> => {

  // console.log(fcmToken, 'fcmTokenfcmToken');

  // console.log(payload, 'payload');

  try {

    const response = await admin.messaging().send({

      token: fcmToken,

      notification: {

        title: payload.title,

        body: payload.body,

      },

      // data: payload?.data,

    });

    // console.log('Successfully sent message:', response);

    return response;

  } catch (error: any) {

    console.error('Error sending message:', error);

    if (error?.code === 'messaging/third-party-auth-error') {

      // console.error('Skipping iOS token due to auth error:', error);

      return null;

    } else {

      console.error('Error sending message:', error);

      throw new ApiError(

        httpStatus.NOT_IMPLEMENTED,

        'Failed to send notification',

      );

    }

  }

};

Solve-1 :

Update your code for multiple users fcmToken.

**

Get a better response without error::

Solve-2 :

1. check your Firebase app settings and create Android and iOS apps.
2. enable cloud messaging
3. to provide correct fcmToken
4. generate fcmToken from the production iOs app.