Yes, I posted about it on the previous page. I called apple care and they took care of it in a few minutes. You will need to log into appleid.apple.com and generate a temporary support pin. Then give them that 12 digit code. Then you should be able to login fine.
You will be asked for a serial number. Make sure you are using your real Mac Pro serial number.
I thought it was something like that. I wonder why it suddenly happens?