Garmin - control your Homey with your Garmin watch

I got the same experience. it was hard to store the settings. most of time settings disapeare after log-out/log-in while using the connect app on my iphone.
I decided to delete everything and install en configure your app only by using garmin expres
This solves the issue for me. It seems synchronisation of app and garmin expres fails or have some serious delays.