I have been trying all week to get my 12-digit code... I submitted a help ticket on Monday morning through SquareEnix's site, and created a thread in the official forum under tech support but can't get an answer to this...
I got the 20-digit code for the beta, but did not get the PS3 code. Apparently SE made a mistake and several of us did not get the 12-digit code.
Has anyone else who is in the same boat been able to get the 12-digit PS3 code after the fact?