Sorry to hear that you’ve run into trouble when using the Zwift Companion (ZC) app as a BLE bridge to pair your Tacx smart trainer to Zwift.
This is actually a known issue as we’ve received many reports of Zwifters unable to pair their devices when using the ZC BLE bridge on Android. You can find more information in the pinned Forums thread here.
Seems our developers are confident this will be resolved soon, so we appreciate your patience while we get it sorted out. Thanks!