On Xbox, my main account is showing as level 0 and is unable to connect. I'm getting the database error. However, I am able to immediately sign in with no problems when I switch to a guest account. I believe somehow my main account (Gamertag: TheMindfulSheep) became corrupted in your database preventing me from connecting, which would explain why it shows as level 0 in offline mode. I'm wondering if this might explain why many others are also getting the database error trying to connect.
I'm not sure if this is the proper place to report this. I apologize if it's not.