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.
The official plugin in is far worse. You'll run into major conflicts with other plug ins and be forced to use the google default UI's. Those were...
It sounds like you are sending the wrong player id in TakeTurn? From the game I'm working on now(inside a co-routine cause my actual code updates...