You may have answered a question in the Form 1099-R section incorrectly.
If your 2021 Form 1099-R has a code 7 in box 7 of the form that is a normal distribution. If you did not roll over any of the distribution to another tax deferred retirement account then the taxable amount in box 2a of the Form 1099-R should have been entered on Line 4b of the Form 1040.
You may have to amend the 2021 tax return to correctly indicate the amount on Line 4b. Contact the IRS and see what they require to correct this mistake.
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