[TFuture](API\Runtime\Core\Async\TFuture)< [EConcertResponseCode](API\Plugins\ConcertTransport\EConcertResponseCode) > CreateSession ( const [FGuid](API\Runtime\Core\Misc\FGuid) & ServerAdminEndpointId, const [FConcertCreateSessionArgs](API\Plugins\ConcertClient\FConcertCreateSessionArgs) & CreateSessionArgs )