When I’m filling out the hsa box twelve what’s the 12b AA and 12c DD box?

AA represents designated Roth contributions under a section 401(k) plan, and DD reflects the cost of employer-sponsored health coverage.

box 12 has many different items.  any HSA contribution would be coded as W. 

when entering a w-2 in TT look at the description provided for box 12 entries.