Firebase cloud messaging authorizion error

Question

i am trying to send FCM push notification to my android app on from postman i have on my developer console two api keys when i try to use the first one i get this response from FCM :

Unauthorized

Error 401

and when i try the second one i get this response from FCM :

Error=MissingRegistration

and i have this data in the body :

{ "data":{
"score":"5x1",
"time":"15:10"
}
,
"to":"*******"
}

the token is working fine and i have test it in the firebase console what the problem could be and what is the solution

Answer 1

Error 401 Unauthorized comes beacuse of wrong server key.

To solve this error:
Go to your project settings in firebase console.
Click on Cloud Messaging and copy Server Key mentioned in that page.

Let me know, if more help is required.