I could solve it in my case now.
I searched some other related topic here in the forum and did a mixture of some suggested workarounds and this finally solved the problem in my case:
1. First my x box network didnt run properly. I just pressed the repair button.
2. Logging out with my xbox account in the sim did not help to solve it, so I downloaded
the x box App for windows and logged myself in and out.
3. Then I started the SIm and logged in with my x box account, the same email as in Microsoft store.
Solved…