In different activities when I select "Workout">"Scheduled" I see the message "Download your training calendar from Garmin Connect", but cannot do anything here.
I have Garmin Tri Coach enabled. The only way to follow the plan for me is to start the Garmin Coach Glance.
This problem was also present on Epix 2: https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/epix-2/396336/training-calendar-won-t-sync-to-watch---download-your-training-calendar-from-garmin-connect-error