The “employer” on the W2 is not my former employer
It doesn't matter. Only the issuer can correct the SSN. In fact, they are required by law to do so, once you notify them. Note also that the issuer can (and may) ask you for proof/verification. Sending them a copy of your social security card is usually all that's required. Overall, getting this corrected by the issuer should be a non-issue really.
