12a is not the proper box to report HSA contributions. The are supposed to be reported in box 12w.
IRS instructions for 12
A—Uncollected social security or RRTA tax on tips. Include this tax on Form 1040 or 1040-SR. See the Form 1040 instructions.
W—Employer contributions (including amounts the employee elected to contribute using a section 125 (cafeteria) plan) to your health savings account. Report on Form 8889.
are you sure it's not 12w. if was supposes to be, your employer is probably not preparing w-2's correctly.
we can do nothing. contact your employer to get this matter resolved.
