@Kris_Kilton and @Jim_ALLEN welcome to Zwift forums.
Are you trying to connect the controllable trainer via Bluetooth, or ANT+?
ANT+ support in Android is still in beta due to the complexity of the Android hardware ecosystem, so
the Android version of the game app does not support controllable trainers over ANT+ yet. It’s coming. Please bookmark this thread, where we’ve been announcing other types of sensor support over ANT+.