I know that in the past there have been versions of radio code that don't play nicely with the multi-radio setups. If you can't get it to work, I would contact the Harris PSPC TAC and see if they can offer any advice. It may be a bug, and in that case it should definitely be reported. I'm not sure if they will do anything for the M7100, but you never know. Lately they have been more focused on the ECP code for the newer 5300/7300 platforms.