Firebase 401 unauthorized error FCM

Question

I\'m trying to test out Firebase Cloud messaging APIs as all functionality is not available from console (notably customization of notifications when app is in background).

Answer 1

I was facing the same problem, i solved it by using the following steps

1- In the server from where you are sending push, Use the browser key only, you can get it from Firebase console or google api console as I have highlighted in the below images:-

Google api console

Firebase console, click on the project-->settings

Note : The Firebase console web api key and google console browser key are the same you can use either of them

2- If you follow the first step only you will get the Unauthorized error, to resolve this you need to authorize your browser key in google console by adding your server IP address from where you will send the push. Click on the edit pencil icon on the right side of your browser key in google api console, above first image

After adding your Ip address click save Make sure that your device token is not empty on which you are sending the push, I hope your push will be sent successfully now.