So it seems when this happens you have to go here

http://support.na.square-enix.com/fa...la=1&kid=68223

and fill out the form and get the Ticket Number number when your done call SE and have them change it you can only do this once so make it count...

Why you just can't type in your ID like you can on PC beats me I guess it's their way of only allowing you to log into one account only on the ps4 which is stupid considering I bought the game I should beable to log into what ever accounts I wan't to when I wan't to...