If you still have the Desktop software installed
Start it up and open your final 2020 tax return.
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Switch to "Forms Mode"
...look in the left window of forms and open the "Tax Payments" worksheet
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All the sources for your Estimated payment $$, (and 2019 refund applied to 2020), that you entered for that year are on lines 1-thru-7 with the total on line 8 (that goes to line 26 of the main 1040/1040SR).
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possible issues with the 2019 refund applied to 2020 amount:
1) IF you indicated that you wanted the 2019 refund applied to 2020 taxes, did you enter it twice, showing up both in the 1st Quarterly estimates (line 1 of the worksheet) and in line 6.
2) For the first two Fed estimates did you make one estimated payment before 15 July , but list it twice on lines 1 & 2 of the worksheet
3) IF you do have a $$ amount on line 6 of that worksheet...and IF you had an IRS refund from 2019 taxes that you had indicated that you wanted it to be applied to 2020 taxes on your 2019 tax return...and IF the IRS changed/reduced that refund when they processed your 2019 taxes?...then you needed to indicate that reduced "applied" amount when you prepared your 2020 tax file, because TTX wouldn't know the refund was reduced..
4) IF you filed 2019, and 2020 taxes really late, and filed both on paper around the same time...then it's possible that the 2020 tax return was processed first, and they don't yet know that the 2019 refund is being applied to 2020 because they haven't processed the 2019 file yet.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
