Creative Cloud keeps logging me out

If I logging in to the CC-App on Windows, it directly signs me out. And tells me to sign in again.

I know this problem isn't new, but I tried every single step but it doesn't work. I reinstalled everything but it doesnt work. What can I do? Pls help me!

Thanks

Also how can I contact the support? I couldnt find any chat-button on this website: https://helpx.adobe.com/de/contact.html