FCM - Not registered

Question

I\'m trying to send a message through FCM to my web app. Unfortunately, I\'ve the following error message and I\'m unable to solve it alone...

Through POSTMAN I rece

Answer 1

The error NotRegistered means that your web app is not registered or the key you are using in the field "to" is not correct. In your case I suspect of the fact that the key is written in 2 lines, and maybe the backspace is being send in the request. Try to send the "to" field key in a single line.