If you submitted your return and it was accepted, you will need to file an amended tax return to include your IRA deduction. You won't able to do that for a few weeks yet as the 1040X should be available toward the end of this month.
You don't have to pay the tax you owe on the original return until April 18, 2022, so you can just file the amendment before that.
Just be sure to change the "Amount paid with return" to $0, so it will show the correct amount that you will get refunded.
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