You will have to call the IRS at 1-800-829-1040. The money is probably credited to 2020 so you would not get credit on your 2021 return.
You can call the IRS and ask them to move it, in which case it could be credited to 2021 and you can get it back as part of your 2021 refund. But it's probably just easier to ask them to send the refund.
It's also possible they will do this automatically. Sometimes it takes a long time. You did not say how long its been since the IRS removed the penalty.
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