The solution is that you print it, sign and date it in ink, and mail it. E-filing is closed for 2021 returns, except for some paid professional tax preparers who have professional software. You cannot e-file a 2021 return using TurboTax. Use a mailing service to track it so you will know it was received because it will take months to process.
**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.**