I have a couple who files as MFS because of student loan issues.  They have one child.  Both parents set aside $2500 in an employer-provided Dependent Care Account. I know they are not eligible for the Child Care "Credit", however it was my understanding that they still qualify for the "exclusion", where neither of them should have to pay taxes on the $2500 they used for daycare.

When I try to file, one return is rejected because the child's SSN is found on the other tax return that was accepted. How do I get the exclusion to go through for both of them?