Currently, it is not possible to directly sync a workout between Garmin Connect and JOIN. However, you can sync your workout from Garmin Connect to Strava and then from Strava to JOIN. While this may be a bit of an indirect process, we are working on establishing direct connectivity between the two platforms in the future. In the meantime, you can follow this workaround to sync your workouts.
My workout is not synced between Garmin Connect and JOIN
