Batboard

All, I'm having issues programming our LMR's. We are full Astro with AES encryption. I'm trying to put two seperate users on the same duplex net using DPL. I set up the DPL with different codes on two seperate channels and the still come over each other. I do have them set in mix mode for receive. Is there something that I missed? Any help would be greatly appriciated.

Rick