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All you can do at this point is enter your W-2 as it is, with box 2 empty, and see what happens. It's too late to have any tax withheld for 2024.

If you end up owing a large payment on your 2024 tax return, you should give your employer a new W-4 for 2025. You can use the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 form to get the approximate refund amount that you want.