Was the IRS letter regarding Earned Income Credit for your 2020 return? Or for a 2021 return that you already filed?
Usually the letter will have a form to return to the IRS and they will calculate and send you the EIC that you didn't claim.
If you haven't filed your 2021 return yet, under Deductions & Credits, scroll down the list of topics to 'Earned Income Credit' and Start/Update by going through the interview.
Here's Qualifications for Earned Income Credit.
@LCM63
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