I'm having exactly the same problem, and I already have Unknown entered in the first and last name fields. My return is still being rejected with this error, which doesn't make sense:
For each child who is born before 2002 per the 'ChildBirthYr' on Form 8839, the corresponding checkox 'DisabledChildOver18Ind' must be checked.
What needs to be done:
Review Form 8839, Qualified Adoption Expenses. The child's year of birth must be a valid 4 digit year.
I've left the birth year blank per the IRS instructions for form 8839, because the adoption hasn't happened, but TurboTax seems to be treating it as if I've entered a value there. I've done this exact thing the past two years without any trouble, as my wife and I have been trying to adopt for several years now, so I don't understand why it's suddenly not working this year. I've checked the PDFs for my previous returns and confirmed that everything matches.
