Ciao. I use a garmin fenix and I have to go into the watch menu and flag on the segment view during the activities to see them. Try to focus on the edge menu.

​@Mattpl This is an ongoing bug for some years, Strava fails to embed all your starred segments in the route before it is transferred to Garmin. Some people found a time-consuming workaround but with mixed success: They unstar all their Strava segments, star them again (but only those that should be visible in the route) and create the route anew. You can read more here: 

I have try this and not work. Take route from strava and sync new segments and not work