Push notifications sent through Firebase Cloud Messaging (FCM) or the former Google Cloud Messaging (GCM) are not guaranteed to be delivered due to software issues . Push notifications may get delayed, lost, or received in a different order than sent.
Is Firebase push notification reliable?
Push notifications sent through Firebase Cloud Messaging (FCM) or the former Google Cloud Messaging (GCM) are not guaranteed to be delivered due to software issues . Push notifications may get delayed, lost, or received in a different order than sent.