Tavarusbair
Returning Member

My return was rejected because my child’s ssn

How do I fix this? It says someone else has filed with one of my dependents socials but my finace(mother of my children) has not even filed her taxes yet and I know this for 100% fact. How do I find out which of my dependents socials was already claimed or has the error for? (I have 4 dependents on my return)