This is just an opinion. i would file 2022 first with the loss carryback election checked and then say in 2 weeks file an amended 2021 return. I am sort of surprised you haven't received notification from the IRS for 2021 about the missing 1256 reporting but some things take the IRS 2 years to catch up on.
when you mail the returns be sure to use a tracking method so you are assured the IRS got it.
you check the loss carryback box only in the 2022 return, however, it seems your version of TurboTax is different than mine because I don't see the exact same thing you presented. Later on another screen it should ask about the amount to be carried back enter as a positive number and remember the limitations. .
for 2021 you need to amend.
on line 1 of form 6781 separately enter “Net section 1256 contracts loss carried back from” and the tax year in column (a), and enter the amount of the loss carried back to 2021 in column (b).
