what year was the NOL? for years after 2020 only an NOL carryforward is allowed. prior to that unless you made an election to carry forward an NOL included with the return an NOL carryback was required before any remaining could be carried forward. while you have a loss on form 4797 that may not be the correct amount of your NOL.
the short version of how the NOL is computed Is the excess of business losses over business income reduced by the excess, if any, of nonbusiness income or nonbusiness losses and expenses.
form 1045 schedule A can be used to compute the NOL
https://www.irs.gov/forms-pubs/about-form-1045
