Hello all,
I’ve marked @Vinz_Clortho 's post as the solution to this issue, but I will flag this up for investigation. For now, I recommend either renaming a workout or creating a duplicate if you want updates to the workout to sync across devices.
I am pooling similar-sounding custom workout issues together in another thread here. If you’re creating or importing custom .zwo files that are not appearing in Zwift, please join the discussion so we can get to the bottom of this issue.