Cannot access Language Cloud from Trados Studio 2021

Within the application Trados Studio 2021, I cannot sign in to the Language Cloud. When I click on "sign in" (button on the top right corner), a window pops up but it remains white and does not display any content.

My licence is activated. I can access the Language Cloud from a browser. However I would need to access the Language Cloud directly in the Trados Studio 2021 application.

I am kindly asking for your help.