FCM getting MismatchSenderId

Question

I have an application that uses Google FCM for sending push notifications.

When i send a push notification to a group of users, i get a response of MismatchSen

Answer 1

As per response "MismatchSenderId", this is a mismatch between FireBase and your local "google-services.json", you have to make sure that both manifests matches

In FireBase console you go to "YourProject > Project OverView > Cloud Messaging" you'll see the "SenderID" which MUST match with the "google-services.json" in your Android project.

Best thing you can do is download the final json file from "General" tab and place it in your project.