I was having the same problem with my F6X. I talked to Garmin Tech Support and mostly got it figured out.
1) The Fenix (and I assume all Garmin watches) have limited storage space for Custom Workouts.
…Custom Workouts seem to compatible with "Other" activity only. Add "Other" to the favourites app then you should be able to see your custom trainings there under Training -> My Workouts in the menu for…
I got the same problem, have you found a solution?
That did it. Workout was there under other. Thanks much!
Same here for my running workouts. Very annoying. Scheduled ok and visible on garmin calendar but nothing on my fenix 5 plus.
Did you find a solution? My run workouts missing from watch too.
That solves half my problem, but unfortunately I'm wanting to do a custom Swim work out with duration measured in time and not in distance. Garmin does not give you the option for time in the duration settings under "Pool Swim". So I made a custom work out instead. My problem is that it will now not count my distance in yards while I'm swimming because it's in the "Other" category of work outs and not in "Pool Swim"....ugh....frustrating.
I was having the same problem with my F6X. I talked to Garmin Tech Support and mostly got it figured out.
1) The Fenix (and I assume all Garmin watches) have limited storage space for Custom Workouts. I was told 20 - 25 depending on the complexity of the workouts. I am using a TrainingPeaks triathlon plan with structured workouts for Run and Bike. I had 23 Custom Workouts already loaded through TP.
2) Adding a Custom Run Workout that I had created and that failed to sync, DID sync once I added it to my Training Calendar and scheduled it for Today. It then showed up under Run as a Workout scheduled for today.
3) I did the same for a Custom Strength Workout that previously would not sync. Once I added it to my Training Calendar for Tomorrow, it transferred to F6 but showed up in the "Other" exercise, not in "Strength".
4) So, check to see how many Custom Workouts you already have loaded on your device.
5) Try scheduling the Custom Workouts for soon (today, tomorrow) and see if they sync. I assume GCM will prioritize workouts based on the calendar and sync ones scheduled soonest.
I was going mad for not being able to upload the workouts... but scheduling them seems to solve it. Thank you!
Very strange that Garmin does not solve this by making them appear as they should but, well, your answer worked for me