Azure Notification Hub no longer accepting GCM API Key

Question

Recently, every time I try to add or modify the GCM API Key in an Azure Notification Hub, I get the following error:

SubCode=40000. Failed to validate credentials with GCM. The remote server returned an error: (401) Unauthorized...

I have tried using the same key that works in other Notification Hubs, as well as creating a new one via the Google Developer's console.

I've also recently come across articles stating that GCM is moving to FCM (Firebase Cloud Messaging). Could this be the cause of my issue? Is Google beginning to no longer support GCM?

Answer 1

There are two important informations:

• Firebase Cloud Messaging (FCM) is the new version of GCM

So we should prefer Firebase Console instead of Google Cloud Console,

• There is a useful article here Enabling Google Cloud Messaging (Firebase)

So we need to enable Google Cloud Messaging in Firebase Console for your added Android App.

Step by step:

-- Open your Firebase Console

-- Add your Android app in Firebase Console.

-- Go to Settings

-- Click CLOUD MESSAGING tab.

-- Take Legacy Server key there and use it in Azure Push Notification Service for Google(GCM) settings and Save it. That's all.

This article helps you how to create a Notification Hub Service in Azure then how to connect your Android or IOS App to Firebase Console etc.