The ability to view a wearable prototype on your Apple watch will be disabled on April 1, 2018

Effective April 1, 2018, we will no longer offer the ability to view your wearable prototype on your Apple watch. However, the ability to create, edit, and view wearable prototypes from the web view will remain unchanged.
We decided to remove this functionality as we are re-thinking our wearable strategy going forward. We want to make sure we provide you with a seamless user experience across any device you are on, including wearables. Please stayed tuned for updates on our wearable initiatives going forward and thank you for your feedback.  
If you have feedback or concerns around this announcement, please contact us to share your thoughts.