Google Cloud Messaging current state is Disconnected in MicroG framework
Issue
When using microG, you are not receiving messages from services that uses Google Cloud Messaging (GCM), now called Firebase Cloud Messaging (FCM)
In the microG Settings app, under Google Cloud Messaging, you see that the Current State is set to Disconnected.
Solution
Open the Phone Dialer and type the following code to register again to GCM/FCM
*#*#2432546#*#*
On you press the last * character, the code you’ve typed should automatically disappear. Exit the Dialer app and check the status into the microG Settings.
You may have to do this action again every time you upgrade your ROM.
Source
https://github.com/microg/android_packages_apps_GmsCore/issues/740#issuecomment-479252876
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