In the acknowledgement detail, the dependent rejected will be listed in brackets. For example:
/efile:Return/efile:ReturnData/efile:IRS1040ScheduleEIC[1]/efile:QualifyingChildInformation[1]efile:QualifyingChildSSN
/efile:Return/efile:ReturnData/efile:IRS1040[1]/efile:DependentInformations[2]/efile:DependentSSN
Value: XXXXXXXXX
Where the X's are entered, the offending dependent's SSN will be listed.