I am working on a 2021 return on ProConnect for a person whose mother was a dependent during 2021. I entered the date of birth and that the relationship is Parent. I keep getting the error below as a Critical Diagnostic, and I can't figure out how to resolve it. Thanks!

To compute Schedule 8812, entries are required in "Advance child tax credit payment received as shown on IRS Letter 6419, box 1." If the taxpayer and/or spouse did not receive Letter 6419, go to the child tax credit update portal at IRS.gov/CTCportal or call 800-908-4184 to get the information needed.