After you file

If the return has been filed and accepted by IRS you will have to wait till IRS processes the return.

IRS has the information about the amount of Advance Child Tax Credit paid to you and they will make necessary adjustments to your refund.

Do not file an amended tax return The refund may be delayed.

If the return is rejected for any reason you will be able to correct the Advance CTC information.

1. Sign in to TurboTax and open or continue your return.
2. Search for Child Tax Credit and Continue.
3. Answer the question on the Let's start with where you spent the most time in 2021 screen and Continue.
4. Change the amount of advance Child Tax Credit.

Click on the link for more information

Advance child Tax Credit