In-app google maps stays gray car2go, uber when on Data

Hi! I have troubles with the uber and car2go app when on mobile data:
Often they do not load the map of google maps. It shows me a GPS locator on the map, where the app specivic cars (uber cars, car2go cars) are, but all on a black background.
Uninstall / Reiinstall does not help
I tried to grant all available rights to the apps.
Google Maps on its own is working fiine.

Any Ideas where the problem could be? As it happens in both apps, always at the same time, I assume it is not app...

In-app google maps stays gray car2go, uber when on Data

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