I am working on FCM notification in my android application.I am having a issues that there are some users who are not getting the notification and those respective notification is being lost.I just want to know what are the scenarios in which the FCM notification can missed out?
Sometimes messages are received within a few seconds, sometimes after a few minutes (could even be over 10 and even 20 minutes!), and sometimes not at all...
This is happening randomly - for example, a message could be received immediately, and a message sent right after it will only be received after 10 minutes.
I have set the priority of the messages to high, and time-to-live to maximum to make sure the messages are not discarded.
I have no problem in time delayed by FCM but i want to know in which scenarios these notification is missing?