Strength Training Workouts ?!?

I just bought a 5X today (I owned a Fenix 3 HR before) and am trying to create a strength training workout (using Garmin Connect or the iPhone app) and sync it to the watch. I can create the workout and the app (on my iPhone) says the 5x supports strength training workouts and allows me to send it but the sync fails for a "Transfer Error". Has anyone had success with sending and using Strength Training Workouts on the 5X? This is part of the reason I upgraded (the 3 HR does not support them) and I am kind of disappointed.