Unable to start Strength Builder Coach Plan on vivoactive 5 watch

I signed up to the Strength Builder Garmin Coach Plan, and the listed workouts are appearing correctly on my Garmin Connect app. They also seem to appear on my watch when I go into Strength > Training Calendar to start a workout. However, after selecting the workout and pressing the top button twice to begin the workout, the watch just returns to the home screen, with no workout starting. I can record manual Strength workouts fine.

Even after ensuring that both my Connect app and watch had the most recent updates, and restarting both my watch and my phone, this feature is still not working. Could you please let me know how to fix this? Thanks in advance!