Since you had a Code W in Box 12 on your W-2, you received a pre-tax deduction for your HSA.
Since you didn't have an HDHP health plan, you won't be able to get the deduction for your HSA contribution.
The Form 8889-T is generated because of the HSA on your W-2. You can still use your HSA for Medical Expenses, you just can't deduct it. You may have an 'excess contribution' which you can withdraw by April 15, 2021.
Click this link for more info on Form 8889-T. TurboTax will fill out the form for you. You may want to go through the HSA section again to check your entries.
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