@Brvanden Okay---even if you somehow did not get letter 6419 you needed to enter any advance child tax credit money you received in 2021 between July and December. If you did not do that then that is likely the source of your problem. Check your bank account for deposits of $300/month for the older child. And check your IRS online account(s) for BOTH parents to see what the IRS says was sent to the two of you---and which should have been entered when you prepared your 2021 return. The IRS usually splits the total between both parents if you had filed a joint return for 2020---so you have to look under both of your SSN's.
https://www.irs.gov/payments/your-online-account
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