This may not be true for everybody, but we went back to 2021 pay stubs and figured out that AA21 on 2022 W2 is the difference between total 2021 contributions and what was reported on 2021 W2.
IOW, AA21 on 2022 W2 was unreported 2021 contributions.
So I added lines for AA and AA21 and entered that into TTax as AA.
