Dutchcloggie

Hello, I have an Epiphone EJ-200 with the 2 pickups. I have been using the BOSS WL-20L wireless transmitters with all my electro acoustics and I love it. But it does not work with the Epiphone. The guitar is fine with cables but not with the wireless dongle. I took it to a repair shop several times and they kept saying everything was working. Until I realised they use a cable and I use a dongle. Does anyone know why this is? Is it due to having 2 pickups, which confuses the dongle?