Let me know if you can get the kiox to display your heart rate from your fenix 6 - I also have a fenix 6 pro, I have succesfully paired it to the kiox , and it shows in the kiox display and on the watch that they are connected, and I have set the fenix to broadcast the heart rate, but the kiox just shows a "-" in the heart rate field. I cant make it work at all.I've just popped out to the garage and turned the bike on. Disconnected battery saver on my Fenix 6 pro, went to Bluetooth on the kiox and it connected straight away to the watch, the kiox is showing both my phone and watch connected with a little heart rate monitor display.
No idea if it will do anything but ill let you no next time I'm out on the bike.