HRM Dual - BT not transmitting HR

I have a HRM Dual chest strap. It pairs and transmits fine to my Edge and more Forerunner via ANT+. My understanding is that it should transmit via BT concurrently, but when I open TrainerRoad or my Wahoo app (for controlling my KICKR), either app can find the sensor, but neither gets any HR data. Is there a way to test if the BT channel is just not working? Or is there something else that has to be done to actually transmit data via BT?