After you file

@flannbarr 

Is it possible you used another TurboTax account to prepare your tax return? Do you have two accounts? 

Let's try it another way. Select Tax Home from the left menu. Scroll down to Your tax returns & documents. Select Show. You should be able to select 2020 and Amend.

The reason I don't show 2020 is because I have not filed a 2020 income tax return.