If this is concerning Box d on your W-2, leave it blank.
Box d on a W-2 is for a "Control Number".
A Control Number is something that your employer's payroll department uses.
It has nothing to do with taxes, tax software does not use it.
Usually, the control number your payroll department uses works when entered on the TurboTax W-2 screen, but if it doesn't fit or shows as an error, simply delete it and leave that box blank.
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