Form 8812 is for the Child Tax Credit. It sounds like you may have 2 children under 6, that you claimed the child tax credit for. If you look at line 28 of your return does it show $7,200? If so, most people received half of the child tax credit as an advanced payment monthly from July through December of 2021.
If you did and did not include that on your return, the IRS found this error when they matched your return to their records and then they made the correction.
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