Firbease (Android) notification stop working.

In my custom mobile app firebase notfication stop working since 1 month. I saw this type of error on log please help me how to slove this:

2025-03-17 00:25:28  WARN: Firebase user 62 error - 403 Forbidden
POST https://fcm.googleapis.com/v1/projects/z1-new-tracking/messages:send
{
  "error": {
    "code": 403,
    "message": "SenderId mismatch",
    "status": "PERMISSION_DENIED",
    "details": [
      {
        "@type": "type.googleapis.com/google.firebase.fcm.v1.FcmError",
        "errorCode": "SENDER_ID_MISMATCH"
      }
    ]
  }
}
 - HttpResponseException (...)

1. Are you using official Traccar server? And which version?
2. What's in your configuration file?

I am using Traccar Version 6.5 on my own VPS.
My configuration for firebase of traccar.xml is :

<entry key='notificator.types'>web,firebase</entry>
<entry key='notificator.firebase.serviceAccount'>
{
  "type": "service_account",
  "project_id": "z1-new-tracking",
  "private_key_id": "2b09ffb9a28e011da5ff5******************",
  "private_key": "-----BEGIN PRIVATE KEY-----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\nxCrVZYYi4SSfmzOjSEWmxP9gdA==\n-----END PRIVATE KEY-----\n",
  "client_email": "firebase-adminsdk-a59zk@z1-new-tracking.iam.gserviceaccount.com",
  "client_id": "103681471269467682927",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-a59zk%40z1-new-tracking.iam.gserviceaccount.com",
  "universe_domain": "googleapis.com"
}
</entry>

Note: I used "****" on private_key_id here on this post.

And you're using the same Firebase project for your app? The error seems to indicate that it's not the case.

I am using same project on app too. And from Announcement menu from admin dashboard when I am trying send message to specific user it works fine. But Notifciation not goes on ignation on or off , command result etc.

Are you sure all the users are/were using the same app?

Yes!

Well, the error seems to indicate otherwise.