have you tried manually entering the info. cut and paste can sometimes contain embedded info that you can see, but that means what you entered isn't valid. crdit cards are probably not valid for depositing the advanced child credit. bank a/c or debit card. some bank a/c's have different routing numbers for deposits than for checks.
and have you used this webpage
https://www.irs.gov/credits-deductions/advance-child-tax-credit-payments-in-2021
