To get a game into Xbox's Creators Program, you need to "Create at least one active user and sign the user into Xbox." I read the Scirra tutorial on the Xbox Live plugin, and the Microsoft tutorials on how to set it up so that you use an Xbox account as a test account on the console, and it looks like I did everything right in event work, but I can never get it to sign in, neither silently nor manually. Any current known issues about any of that?
edit: It looks like the real issue may be that the Gamertag doesn't really show up? Are there any known issues with that part?