Regard to ticket TIMOB-25501, customer try to use SDK 7.0.0 and cloudpush 5.0.0 to verify if it fix the problem. But find another problem.
Customers sent notifications from dashboard when the app is in background but not getting the notifications(or even not added to notification tray) even the "sound" property is removed.
This issue is only happened on Android 8.
Another device with Android 6.0.1 is working well.