Need somone to try an app on a Venu 2

I have a user of my app on a Venu 2 and he is saying that he can't add it to the favorite list and therfore he can't use it. He tried to uninstall and reinstall it with no succes

Could somone that have this watch try it out?

https://apps.garmin.com/en-US/apps/50c5c223-28fe-47cb-aed5-658bfbf3d1d1

Thanks