Last year? Like like April in 2021? Last year you could only efile a 2020 return. You had to print and mail 2019. So it thinks your 2019 return was for 2020. And to do 2019 you had to use the 2019 Desktop program installed on your computer.
So now you need to amend that 2020 return that got filed wrong with 2019 and make it for your real 2020 info.
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/00/27439
Then you still need to do an original 2019 return. To do a prior year return you have to buy the Desktop program here,
https://turbotax.intuit.com/personal-taxes/past-years-products/2019/
Or are you in Canada? I don't know if it's the same. Don't use my USA links above. Here is the Canada forum
https://turbotax.community.intuit.ca/tax-help
Or Contact TurboTax Canada Support
https://support.turbotax.intuit.ca/contact/
You will need a full Windows or Mac to install it on.
