You should use the Desktop CD/Download program to fill out 2021. You can even use the Forms mode to fill it out since you won't be filing it. And you can buy a low version like Deluxe. All the Desktop programs have the same forms. You just get more help and guidance in the higher versions. But I wouldn't buy Basic. That doesn't include state and has some other limitations.
If you get 2021 to match what your accountant filed then you will have the .tax2021 file to transfer into next year 2022 (either to the Online version or the Desktop program).
