Can't sign in to CSEO WVD anymore

Since the Mac application has been updated last week, I can't sign in into the CSEO WVD anymore. It just doesn't work.

I get a popup to authenticate that is pre-populated with my *personal* account (I have a personal Office365 Business account). When I try to sign in with my Pernille-Eskebo.com email, I keep getting redirected in a loop back to the sign-in page which it's pre-populated with my personal account. Tried  multiple times and couldn't get it to work.