Huh? Are you using the Desktop CD/Download installed program? Or the Online version? You can always transfer from the prior year.
If you are using the Desktop program you need the prior year tax file ending in .tax2020 (or .tax2021 for next year) to transfer.
If you used the online version you need to log into the same account.
Where are you stuck? Don't try to transfer from a pdf file. That only transfers basic info like your name, ssn and AGI.
