Sign Up on HoloLens2 doesn't work

Hey Guys!

I Installed the SketchUp Viewer on my HoloLens 2 Device a few days ago.
When I try to Sign In with my already existing account, it doesn’t work anymore.
The Sign In Menu doesn´t go away but I also can´t Sign In - I would like to know why the App doesn´t do its job.
Thanks in advance for any advice

Do you have a payed plan, too?
It might be that your trial has ended.