A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
I really wish there was another announcement on the blog - need more publicity! I had to search for a long time to find the downloads!
Similar sounding problem here - is there a bug report we can track?
Also happens when trying to use Unity Analytics on WebGL... And by use, I mean just having 'using UnityEngine.Analytics'