MicroG settings > Google Cloud Messaging
I had the microg “installed but not connected” bug.
I fixed it doing this :
- Reset the phone (flashing unlock/flashing lock is enough since it erases userdata)
- Before installing any app :
- Open the dialer
- Type
*#*#2432546#*#*(*#*#CHECKIN#*#*) to force the registration to GCM
- Install my apps & restore my data.