Can't connect my smart bike to Garmin Training App

Hi guys, I have a smart bike that can connect to any apps with bluetooth (Zwift, MyWhoosh, etc...) The bluetooth connection works fine.

Recently I made a custom training on Garmin Connect and I wanted to try it with the Tacx Training app but I can't find my bike while trying to pair it with the app.

Is there something I am missing ? I tried with both my android phone and my iPad but nothing worked. (The bike isn't connected to something else)

I don't think Tacx app works only with garmin devices, does it ?