I need to get a copy of my 8879 form from my 2022 tax return. How do I find this? It is not in my pdf that I downloaded.

There will not be a Form 8879, IRS e-file Signature Authorization included in the PDF of your tax return.  Your tax return was self-prepared and e-filed by you using TurboTax.  It was not filed by an ERO.

When you e-file your tax return using TurboTax there will be an Electronic Postmark Report included in the PDF.  The Report will have the date/time the tax return was transmitted and the date it was Accepted by the IRS, if accepted.