Firebase FCM push, getting Error Missing Registration | Android

Question

I have seen this topic discussed before, but I think it\'s not the same scenario.

I\'m trying to send push notification from one device (going to be an admin device)

Answer 1

I was using/trying to send FCM Push notification using Postman web API Client app, to FCM URL: https://fcm.googleapis.com/fcm/send

And I had used a wrong Content-Type: application/x-www-form-urlencoded, So I changed it to

Content-Type:  application/json

This is basically required, as we are sending the Push Notification as a JSON Payload.

Cheers!