"You could not log in because the service account in question is not registered. If you would like to log in to the service, please log in to the Square Enix Account Management System and register the service account."
Guessing this is their way of saying I didn't get in despite the possibility of not getting any email from them ever regarding anything XIV related.
For the sake of curiosity, could someone who got in check their SE account under "Services and Options > Confirm Membership Status > All Services Display" and see if it mentions XIV at all?
XI Wiki


