Why won't Turbo Tax 21 pick up my 2020 tax info

Are you in the same account?   You may have to go a little ways into 2021 for the transferred info to show up.

How to transfer into Turbo Tax Online, including from a pdf file or other software or from the Desktop program

https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-turbotax-online/00/25953

It's common to end up with multiple accounts. First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used
https://myturbotax.intuit.com/account-recovery/

If you used the Desktop CD/Download program then the only copy is on your computer and not saved or stored online. But you can still transfer from it.