That'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.

Looking for my last year tax return

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@Twilkins wrote:

Looking for my last year tax return

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To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...

If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created.  TurboTax does not store online any returns completed using the desktop editions.

Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

For a fee of $50 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf

I've purchased 2021 and it's saying that it can't locate my 2020 file to pre-populate, but I see the Turbotax 2020 shortcut on my desktop. I use that last year and e-filed but noting in MyDocs on Windows? Please advise 

The shortcut is probably to the 2020 program not your tax return data file.

You need the file ending in .tax2020 to transfer into this year.  It should be in Documents in a Turbo Tax subfolder.  Or Search your computer for all files ending in .tax or .tax2020.  And check the Recycle Bin.  The PDF file should be saved there too.  If you have Windows 10 check the OneDrive.  Or to Drop Box.  Check your backups.  Could it be under a different user on your computer?   

If you don't have the main .tax file you might have one that starts with a Tilde sign ~ like  "~your name.tax2020"..  That file is if your computer crashes or your real file gets lost or deleted or corrupt so you can restore it.

Find your Tax file in Windows

https://ttlc.intuit.com/community/tax-data-file/help/find-your-tax-data-file-tax-file-in-windows/00/...

Here's an idea.  Do you still have 2020 installed?  Try opening 2020 program and see if you can get your 2020 return to show up in it.  Go to FILE - OPEN.  Then save it again with a name and place you can find.  Go to File - Save As.