IRS sent me a letter asking a return for the Additional Child Tax Credit for one of my kids arguable due to the missing SSN then. She now has it. What should I do? Thnks

[Critter-3]

If the SS# was issued AFTER you filed the return you are not eligible for the CTC ... AND  you cannot amend the return  to get the credit after the SS# is issued . 

[hilgaz]

Thanks for your response.