I have implemented firebase
fcm push notification for android app but it is receiving on some android devices only. Not receiving on Oppo, Vivo, Redmi and operating system Nougat and Oreo. I have implemented Messaging Service and Instance Service. Successfully created token. Also implemented Boot receiver and give permission of Wake Lock and Receiver but still not receiving notifications.
Also tried these links:
Xiaomi does not receive notification when application is not running
https://android.stackexchange.com/questions/152649/what-is-protected-apps-in-huawei-phones
https://github.com/caffeinalab/ti.goosh/issues/47
Android - FirebaseApp / Firebase-Initialization is not starting