Amazon SNS: “Platform credentials are invalid” when re-entering a GCM API key that previously worked

Question

We have been using Amazon SNS to send Android push notifications since April this year.

Pushes have sent with no problem, however there has never been any record of

Answer 1

API Key management for GCM has been moved to Firebase Console. You can create a new Firebase Project (or import an existing cloud project) and you should obtain a new Server Key for Cloud Messaging.

see the updated documentation:
https://developers.google.com/cloud-messaging/android/client#create-an-api-project
and the stack overflow question: Where can I find the API KEY for Firebase Cloud Messaging?

if you still have problems please contact:
https://firebase.google.com/support/contact/troubleshooting