Can't access some online functions

Hi. I bought Forza Motorsport 7 Ultimate edition for me and my brother. I was looking forward to trying it too but I can’t get access to the online features like design for cars etc. It’s saying that it is temporarily disabled. And I don’t understand what it means.We share one computer but we have our own gamertags on xbox account. My brother says that everything worked for him even the features that i can’t get to work. I hope there is possibility to play fully one game on one PC but with two accounts.

I will be glad for any response. I don’t play game often but when I do I want them to work as they should. The game wasn’t cheap.