CatinaT1, that's not accurate. I e-filed a 2022 amended return today, and it was accepted. I then went through the exact same steps to file an amended 2021 return which TurboTax allowed and gave the e-file option to have it be rejected less than a minute after hitting submit with the above stated reason. If they don't allow 2021 amended returns to be e-filed, why do they auto-default to the e-file option for the amended return? Either way, it's a flaw in the TurboTax software.
