A 2021 return cannot be e-filed. E-filing is permanently closed for 2021 returns. Did you misunderstand the email from TT?
When you e-file your federal return you will receive two emails from TurboTax. The first one will say that your return was submitted. The second email will tell you if your federal return was accepted or rejected. If you e-filed a state return, there will be a third email to tell you if the state accepted or rejected your state return.
If you realize now that your return was not e-filed successfully, then you will need to file it by mail. E-filing is permanently closed for past year returns. You will need to print the return, sign and date it in ink, and mail it in.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**