See if you have any other .tax2020 files on your computer. Maybe you transferred from the wrong one. Or you changed your return after filing like to test?
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 2019 return to show up in it. Go to FILE - OPEN. See if it is the right one. Then save it again with a name and place you can find. Go to File - Save As. Then start a new 2021 return to transfer it.
