Trying to get AGI for 2020 that I filled with Turbotax,but site said that I didn't file with them!Any advice?

[MichelleLO]

If you do not see your 2020 tax return data, it might be in a different TurboTax account. You can check to see if you may have multiple Intuit accounts by following the steps in the below help article.

How many Intuit accounts do I have with TurboTax?

If you still don't find your tax data, please reach out to TurboTax Customer Support for additional assistance. 

What is the TurboTax phone number?

[VolvoGirl]

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.

You can also request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript