In order to transfer 2020 in to 2021 you have to use exactly the same account and user ID and do that transfer at the very beginning before you enter any new 2021 data at all.
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Account recovery
https://myturbotax.intuit.com/account-recovery/
How to transfer last year’s return? https://ttlc.intuit.com/questions/1900883
**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.**
