When attempting to switch over an existing user to a new user, I got the "email is invalid" message - and I know I put in a valid email. It seemed like this could be due to an account under that name having previously existed, but that it would be something you would have to check on you end. Can we get this checked to see if that is the case?
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.