FCM Not Receiving Notifications in Android

There are some reasons for this issue and sometimes its depends on device

CM having two ways to send notifications

Data messages

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
"data":{
"Nick" : "Mario",
"body" : "great match!",
"Room" : "PortugalVSDenmark"
}
}
}

it will trigger the FirebaseMessagingService onMessageReceived method.
it will not work on some devices, when an app is in the background.

Notification Messages

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
"notification":{
"title":"Portugal vs. Denmark",
"body":"great match!"
}
}
}

Notification messages are delivered to the system notification tray when the app is in the background.
For apps in the foreground, messages are handled by a callback function

onMessageReceived method of your FirebaseMessagingService

To avoid the issue of not receving messages
add below code in manifest file

If we set to true, this service with be automatically stopped when the user remove a task rooted in an activity owned by the application. The default is false.

If the flag is false, there is an onTaskRemoved callback in your Service class.

In this case you can detect the onTaskRemoved on "swipe" event and you can again start the FirebaseMessagingService

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