If one of the children turned 17 before the end of 2020 that is why you cannot get the CTC for that child. Per 2020 tax law, you lose the CTC in the year that the child turns 17. Or...check to make sure you entered a Social Security number for the child, and see if you said the child lived with you for at least 7 months of 2020.
https://www.irs.gov/help/ita/does-my-childdependent-qualify-for-the-child-tax-credit-or-the-credit-f...
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