Heart Rate Monitor Connects, no readings

My Wahoo Tickr, which works fine with FulGaz, connects to Zwift, but yields no readings. My smart trainer is a Kinectic Road Machine T 6400. I view my rides on a Lenova Windows 10 laptop. I connect using my Samsung Galaxy S9+ phone and Zwift Companion app. I have tried to get HR reading with the Bluetooth on my computer both on and off. I have also tried using the Bluetooth connection option. Help!