sorry 12 w is strictly for HSA which are completely different than an FSA
this is from IRS w-2 instructions for 2024
"Code W—Employer contributions to a health
savings account (HSA). Show any employer
contributions (including amounts the employee elected to
contribute using a section 125 (cafeteria) plan) to an HSA"
(HSA's are also section 125 plans)
https://www.irs.gov/pub/irs-prior/iw2w3--2024.pdf
You can not have HSA coverage if you have FSA coverage
Since FSA salary reductions are contributions to the account and aren’t included in your taxable wages on your W-2, you don’t enter them as a deduction on your tax return. They may appear in Box 14 of the W-2 for informational purposes only. You can verify this with your employer.
see this link
https://fsastore.com/articles/learn-can-i-have-an-fsa-and-an-hsa.html
you can do nothing in Turbotax the W-2 is coded wrong. the amount on 12W will carry to the HSA form line 9
further from the instructions for form 8889 (HSA)
Employer contributions (including employee payroll
contributions through a cafeteria plan) include any amount an
employer contributes to any HSA for you for 2024. Also,
include contributions made by a health insurance plan on an
employer's behalf. These contributions should be shown in
box 12 of Form W-2 with code W.
