In all likelihood, the IRS will simply send you a letter requesting your signature and once they receive your signature, they'll go ahead and process your return. If you need to amend your return, you will not be able to until it has been accepted/rejected by the IRS. Please see the below FAQ for more information on amending a 2019 tax return:
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
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