Cannot connect to Xbox App & Flight simulator

Installation finished, I had the bug of the grey shop because the online functionalities were deactivated, everything goes well it’s very strange because to solve the bug I had to

I had to recreate another microsoft account, and on this new account I have access to Flight simulator while theoretically the game is registered on my main account, right?
I tried to reconnect to my main account but I still have the bug, I think my main account is definitely buggy and dead…