Assuming they are referring to claiming zero on your W-4, it would not have an impact on your Recovery Rebate Credit. As long as you follow the steps by Irene2805 above, your return will be prepared to include the Recovery Rebate Credit as applicable.
The credit is intended to give those who should have received a stimulus payment but never did a tax credit on their tax returns. Any excess credit is then refunded to you if there is an overpayment on your tax return.
Please see the attached link for more information on who can claim the credit.
Recovery Rebate Credit eligibility
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