Relay limitations • Multiplayer • Unity Docs

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Relay limitations

Understand the constraints and boundaries of the Relay service.

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The underlying Relay service within the Multiplayer Services SDK has the following limitations:

Relay is engine agnostic. If you use Relay with Unity, the recommended best practice is to use the Multiplayer Services SDK. Use
```
SessionOptions
```
with
```
WithRelayNetwork
```
to configure a session to use Relay networking.
Players can only connect with other players within the same session.
Currently, there's no region-locking functionality; anyone can request an allocation in any region if the region has enough capacity to support the request.
The Relay service routes all communication through a single region selected by the host. As a result, cross-region communication might not offer optimal latency.
A maximum of 150 players can join the host in the same session. Not all game types will scale to that high amount of players without the use of a dedicated game server. Carefully consider the impact on the host player when attempting high player count sessions with Relay. This limit's aligned with the maximum number of players allowed in a Lobby.