The cost for employer-sponsored health insurance is supposed to be reported with code DD. Code W is only used if either your employer, or you, or both, deposit money into an HSA. Code W is not used to report the insurance premiums, even if you have an HSA-eligible insurance plan.
On the off chance that your employer did deposit money into an HSA that you don't know about, you need to get those details so you can start spending the money, and you need to complete the HSA interview.
If the employer is reporting your premiums, and not HSA deposits, then your employer needs to correct your W-2. If they don't issue a corrected W-2, the IRS will send you bill for taxes and interest for the supposed HSA contribution that is not reported correctly.
