Now I'm getting the above listed problem on my main Xbox Live profile MIABrynn, and can't log in at all with my wife profile Whit8897. We get error code 770 mostly, and 721 occasionally when we try to log in with that account. It's about 4:1, error 770:721.
This shouldn't happen as it was beta tested thoroughly, from what I've seen.
It's frustrating to the point where EA should be offering full refunds.