We adopted our daughter from foster care in Nov 2018 and changed her name and SSN. We completed Form 8839 but listed her with her previous name and SSN. Is this going to be a problem? Do I need to amend? We did receive her updated birth certificate and new SS card but we didn't receive that until Jan 2019.
Yes, your tax return needs to match current SSA records.
If you used the prior name and SSN, you return will be rejected or you will be denied the tax credits.
Congratulations on your new daughter!