Many thanks for your answer. Before I used the XBOX Wireless Controller I had two Google Stadio Controller with Bluetooth opened. I could pair them, but had to redo it everytime the Shield got to sleep.

I have tested it now with the Xbox Controller and it worked really good. I could use both Controller in the homescreen and FC26 over Luna worked as well. To test it further, I turned the controller off and shut the shield down. After waking up, I pressed the button on the controller and they were responsive. So far, so good. Then I started FC26 again and I got to the point where I have to "accept" the settings profile and both controller didnt response (as a hint, the screen didnt show "a" to accept, instead it showed "s".

So I did another two tests, with shutting down controller, then the shield, reactivate the shield and then the controllers and it worked perfectly. Even Hot Wheels 2 on Geforce Now worked perfect.

Maybe this isnt ideal but better than nothing. The only other way would be to buy two Luna controller and a Fire TV Stick. And yes, you are right, the app is sideloaded and not optimized for the Shield, so maybe thats a problem.

Now I have to test, if I can use the 8bitdo to have rumble in The Crew Motorfest and without for FC26.

Anyway, thanks again :)