- I am using the standard keyboard that is integrated with Graphene OS.
- There is no app with admin privilages.
- Developer options and ADB are not enabled.
BUT I figured out what is the actual problem which I describe here for future reference:
I was using the Scalable Capital app in a separate Graphene OS user that is not the owner. This seems to be the problem. If I use Scalable Capital with the owner user on Graphene OS the login in the Scalable Capital app works as intended and there is no error message.
As some people like to use financial apps with a separate user on Graphene OS it might be a good idea to inform them that some apps don't like to be run with standard users that aren't the owner. Maybe this could be included in the FAQ :)
Thanks for your afford and tips!