According to the information on the TurboTax website, my AMENDED return does meet all of the requirements for e-filing. It is within the 3 year window and the original return was e-filed with TurboTax, and the original return has been processed.
The software says it's eligible and after completing validation it presents the Transmit Now button, only then does it say the date of signing must be between 1/1/22 and 12/31/22. @CassLO
