The IRS will not accept two original returns. As tax champ @Mike9241 says, the "IRS doesn't even know the revised return exists."
Your return may also be delayed if you are claiming the Earned Income Tax Credit or Advanced Child Tax Credit. By law, the IRS cannot issue a refund involving the Earned Income Tax Credit or Additional Child Tax Credit before mid-February so those returns are automatically delayed.
Have you checked Where's My Refund? This will tell you the status of your return.
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