Hi ​@Ingrid Bortels !

Can you tell me which device the problem occurs on?
You mentioned phone and desktop app so ...

I have a blank screen on my Windows 10 PC with the app from the Microsoft store. Deinstallation and fresh install did not help.

could you please share a screenshot with the problem that you mentioned? ​@Maaareee 
Thanks

Yes, of course.

There you go.

EDIT:

NVM. I just in this minute figured out, there was a firewall problem. Somehow, the firewall started blocking the Deezer app. 

Can’t you add Deezer to the trusted websites in your firewall?

I get the windows app going black screen - after I have run windows update.

And it worked good before this Windows update?