If you have another W-2 from this employer with an amount in Box 1, you could enter it with the Box 12a, Code W amount from the second W-2.
If not, you could add $1 to Box 1 and add the W-2 with the Box 12a, Code W amount.
OR, in the HSA interview, when TurboTax asks if your employer told you about any other HSA contributions answer Yes, then enter the code-W amount in the box for Employer and payroll contributions not reported in Box 12 of your W-2 (then don't enter your W-2).
Click this link for more info on W-2 With Box 12a, Code W only.
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