The TurboTax online editions have closed for tax year 2021.
You have to sign onto your 2021 online account using the exact same user ID you used to create the 2021 online account.
Close all TurboTax windows on your web browser (including this one). Copy and paste the account recovery website link onto a new web browser window and run the tool.
Use this TurboTax account recovery website to get a list of all the 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 none of the user ID's received will access your 2021 account, then use the option shown in blue on the account recovery website, "Try something else"
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.
To access your prior year tax returns sign onto the TurboTax website with the User ID 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 .tax file
See this TurboTax support FAQ for completing a tax return originally started with the online editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/finish-prior-year-return-started-turbotax-online/L9Oe4M90A_US_en_US?uid=lb2wixup
If you paid for the TurboTax 2021 online edition with a credit card you will need to contact TurboTax support so they can push a 2021 installation file to your download account.
See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
See this TurboTax support FAQ for completing a 2021 tax return originally started using the TurboTax online editions - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
If you already started in the Online version you can move your return to the Desktop program even without paying for Online.
First download the .tax file from the Online version,
Then see, How to Switch to Desktop,
After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. So you first might need to start a fake return to be able to download the state program (go to FILE - New)
Then you just OPEN the .tax2021 file, go up to File-Open. You don't import or transfer it.