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

We spent hours and hours to resolve this issue. What we found that token was being generated using different FCM account settings (google-services.json) and notification was being set using different FCM account. When we synced both it worked like a charm.