MQDH / Continue in your Browser

Hello!

I am unable to login to the MQDH desktop application. I already tried the "WIN+R - google.com"-Solution, but it did not work. I tried Edge and Chrome as default browsers.

I just see a little flash in the MQDH after i click the blue Start-as-Button. But it stays at "Continue in your browser" without an error message.

EDIT: I am on windows 10.

Hoping for some ideas 

Thanks, Stefan