EDIINT AS2 With a IBM Templar server

Hello, I am send a 997 document from TN EDIINT AS2 to an IBM Templar machine. We are requesting a signed MDN back from our trading partner. The returned MDN is always processed with errors or Invalid in TN. I keep getting a message saying that the MDN is not signed. I confirmed with out trading partner and they are signing the MDN. Has anybody seen this problem?