The recovery rebate credit is shown on line 30 of your 2021 Form 1040. The software asked you if you received the 3rd EIP payments of $1400 per person and you had to answer whether you (and your spouse if you are filing jointly) received the $1400 in 2021. The IRS also sent you letter 6475 about it and you needed to enter the amount from each spouse's letter.
If you were supposed to receive any recovery rebate credit it went to line 30. The IRS checks line 30; if you make a mistake on that line they can reduce your refund if their records show you already received the payment.
If you are trying to work on a 2021 return you find the recovery rebate credit in Federal Review.
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