Hi! I did uninstall all the Updates for google-play-services.
Settings > Apps > Opened the google-play-services. In the right upper corner are three dots “Aktualisierungen deinstallieren” in German, i think translation is “uninstall Updates”. With that you reset google-play-Services to factory Settings.
. Then i had to sign in again with my google account and install the updates for google-play-services.This procedure helped in my case, maybe i was lucky. As i wrote before, i assume with this procedure you might lose data/Progress in other Apps. I was desperate enough to try… good luck!