Activities like Pilates or HIIT won't sync from Strava watch app to phone app

My running, walking even pickleball all sync automatically after I have saved them from the Strava app on my watch. I have tried for the last 5 workouts to record a pilates or HIIT workout, and it appears that it has recorded on the watch, but these workouts never show up on my workout activity log. Today, for instance, I did a pilates workout ending at 7:15am, and a walk at 8am. The walk shows up but not the pilates.