I am working on an FCM notification in my Android app. I am having problems with the fact that there are some users who do not receive the notification, and these corresponding notifications are lost. I just want to know what are the scenarios in which the FCM Notification might be skipped?
Sometimes messages are received within a few seconds, sometimes after a few minutes (maybe even more than 10 and even 20 minutes!), And sometimes not at all ...
This happens randomly - for example, a message can be received immediately, and a message is sent immediately after it is received only after 10 minutes.
I set the priority of the messages to high and the lifetime to the maximum to ensure that messages are not discarded.
I have no problems with the time delay in FCM, but I want to know in which scenarios is this notification missing?
source share