I have the primary account with the GT: Sicc Methods. I have three sub accounts as well. One for my wife and one each for my two children, son and daughter. My son cannot sign in under his profile. I get a message that says:
Fix this on the web.
There's a problem with your account. Fix it at account.live.com, then come back to sign in.
I've logged into my account and there is nothing that states there are any problems with my account or his. I've been on LIve for 10 years and I've never had a problem. I've searched the web and cannot find any similar issues.
My son is only 7 and has worked hard for his Gamerscore. I'd like to get this fixed for him.