Thanks to you both, now I know what happened. I'm sure my AME just checked the "declined to submit SSN" box when he updated my application. I must have skipped over that box when I filled out the form on MedXpress, submitting my actual social. Between that and the justifiable frustration with the clueless new front office personnel, I think I assumed an additional error was made. I don't even see the need to call OC at this point.
Zondaracer... did the number that was generated for you start with something like 998? That's what I got.