Are you on a Gym with the Technogym Group Cycle Connect and you want to use it for Zwift or any other training apps (even Peloton)?
I have the solution for you! QZ Fitness app ( http://qzfitness.com )
With QZ app and a Garmin Watch you will be able to connect the bike to QZ and sends all the metrics to your favourite app!
Just enable these settings on the QZ app
Pair the sensors from the bike to your Garmin Watch and download the QZ companion app for Garmin! https://apps.garmin.com/en-US/apps/3746ce54-a9e9-42b0-9be9-b867f8d20f7d
Let me know if you have any other questions!