Can't find "2021 Schedule D for AMT" for 2023 carryover

[s4v68759eb]

I am being asked to "Check this Entry" for "2021 Schedule D for AMT" lines 7 and 15 in order to finalize my 2023 return involving capital loss carryover.

There are values in line 21 and "2021 Form 6251, line 4, alternative minimum taxable income" that I can't find in my downloaded copy of my 2021 return in order to figure out which lines 7 and 15 I'm supposed to grab. As far as I can tell, I did not submit a Schedule D AMT or Form 6251 in 2021.

Also, the number listed in the "2021 Schedule D for AMT, line 21" does not match the amount on my submitted 2021 Schedule D (which as far as I know was not AMT). 

[ThomasM125]

Line 7 on form 6251 in 2021 would be your alternative minimum tax (AMT). Line 15 is used to calculate the AMT using maximum capital gains rates and would flow back to line 7.  Line 21 on schedule D would be the net capital loss allowed in 2021, which is limited to $3,000.  If you didn't pay alternative minimum tax in 2021 then you can try entering $0 for the amounts requested for lines 7 and 15.