I think I've read that there is difference with Desktop or Online to efile prior year returns.
On Feb 20, 2024 an employee posted this……..
According to our tech support team, this is not a product defect. TurboTax Desktop for prior years does not support E-file for amendments like TurboTax Online does. Apparently, the signature date is the trigger for rejecting an e-file attempt.
https://ttlc.intuit.com/community/after-you-file/discussion/tt-desktop-won-t-let-me-e-file-2022-amen...
