The base URI of the MatchMaker that this NetworkMatch will communicate with.
The default address for the MatchMaker is mm.unet.unity3d.com
Using this address will connect a client to the nearest datacenter geographically. However, because data centers are siloed from each other you will only see matches occuring inside your current data center. If a player of your game is traveling to another part of the world, for instance, they may interact with a different set of players that are in that data center.
You can override this behavior by specifying a particular data center. Keep in mind generally as distance grows so does latency, which is why we run data centers spread out over the world.
To connect to a specific data center use one of the following addresses:
United States: us1-mm.unet.unity3d.com
Europe: eu1-mm.unet.unity3d.com
Singapore: ap1-mm.unet.unity3d.com.