I can sign into my account (obviously), but when I start a game it asks for a confirmation email/password entry. I enter it (correctly, because it tells me so), but then gives me the Error code 80072EF3, which wont allow me to sign in when using a game. I've changed my password and used a the new password, and still the same problem.
I've switched games, and its the same problem.
I've deleted my profile and cache (3 times) and then re-downloaded (3 times), and I continue to get this problem each time. There is a thread that goes over this, and lots of people are having the same issue, but we are of course told to make a new thread.
I should mention I also tested my connection to Xbox live and everything went through just fine. I suspect the error is on the server side, somewhere.