Google Cloud Messaging doesn't seem to work

I had the same problem with signal and no GCM-login, and i solved it by entering the following phone number
*#*#2432546#*#*
(found at https://github.com/microg/android_packages_apps_GmsCore/issues/740#issuecomment-478675965 )
my workflow was:

  • entering the phone number
  • backup signal data (check signal menu)
  • Signal App --> stop and delete all data and cache
  • stop blokada
  • reboot
  • wifi off
  • entering the phone number again
  • start signal and restore from backup
    Then Signal and other apps were registered in GCM
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