Don't use the left menu column. Try this instead: (at the FAQ choose the Online paragraph) :
Here's how to amend a 2020 Online return:
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/01/27439
When you do that as described in the FAQ, are you not finding any evidence of your 2020 return in that account? Are you not finding your 2020 return at the Tax Home when you scroll down and expand the section "Your Tax Returns & Documents?"
Hopefully, you found it OK there in that section, chose 2020, and then the link to Amend. But if you didn't find it, I'll go ahead and tell you below how to look for multiple accounts.
When you log into that account, what status is shown at the Tax Home? Which of these terms: accepted, rejected, printed, started, ready to mail, or what? Or does it ask you to start/continue a return as though you haven't filed a return in that account?
If there's no evidence a return has already been filed in that account, you may have more than one account. Many people end up with multiple accounts without realizing it. Here's how to troubleshoot for multiple accounts (User IDs) :
You can have up to 5 accounts that use the same email address for notification purposes. A User ID may be an email address, but it doesn't have to be. It might be only part of an email address, or it can be anything at all.
To get a list of your User IDs, reset password, and recover account access, etc., you can use the tool at the link below. When using the Account Recovery tool, try using your phone number first if you can still access it. After that, if necessary, then run the tool on your email address(es) you can access.
NOTE: Before running the account recovery tool below, log out of all Intuit accounts including this user forum, or you might end up in a loop. Then clear your browser Internet cache, close your browser, then reopen it, and go to the link below. You may wish to copy this link so you can paste it into the new browser session.
https://myturbotax.intuit.com/account-recovery
If still no luck after running that on your phone number you can still access and email address(es) that you can access, here's another method:
Go back to the tool again, but this time leave the data field blank, scroll down a bit, then choose the small blue link that says "Try something else", and it will look you up by SSN and other parameters.
