I am having the same issue..
I am going in a loop.
I try to Register.http://i61.tinypic.com/152esyr.jpg [i61.tinypic.com] (Your Account is already registered. Please Sign In.)
I try to Sign-In. http://i58.tinypic.com/23syebr.jpg [i58.tinypic.com] (Your Account has not been signed up for CTE. Please Accept the Terms Below.)
EA support said the Studio knows about people not able to sign up.
They could not give me a master ticket number because they said the Studio is working on it.
I have not seen any mention of it besides a few people posting.
The only thing I know to do is wait at this point and hope that DICE really does know about this issue and hope that support didn't just tell me that to close the case.
We will see.
I noticed the last post was two days ago. Did you get the Issue Resolved?