Hi,
I have a strange problem regarding Android FCM (formerly GCM) notifications. We have a popular Android game that heavily uses FCM notifications. On a busy day we sent about 8 million notifications.
The problem is: some of our players report that they do not receive any notification messages. I checked their FCM registration tokens (or registration ids) by using Google Play FCM diagnostic tool. The status of the messages are shown as “Arrived”. That means Google Firebase Notification Server successfully received notification message but somehow do not send it to device.
I also tried to send test notifications to those devices by using Firebase Console. But that messages also did not received.
Do you ever experience anything like that?
deniz.