Technical support anyone?

Help wanted!! I have a new kickr Core, running through Apple TV 4k and have bought a Viiiiva 4iiii HRM to bridge the garmin cadence sensor. Now when i setup everything up and run the workout on the IOS app all data seems good.when itry and run it through android the cadence goes haywire and when i try to connect to zwift the cadence stays at 1 RPM. sugestions please. I have vector 3’s but dont really want to have keep swapping them at this stage from road bike to tri bike to trainer!