https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-f...
According to the IRS if your return, even an amended one is still processing then you will not receive the advance child tax credit payments. Go to topic Q B 12 as of June 30th there were 35 million US income tax returns that had not been processed and estimated only 3% of phone calls were being answered. Verify that here
