Add a method in the GameSceneManager.cs script to handle the OnReady event of the SceneSpawner.

GameSceneManager.cs

  public void OnSpawnerReady(bool alreadySetup)
  {
      Debug.Log("OnSpawnerReady " + alreadySetup);

      if (!alreadySetup)
      {
          int spawnPointIndex = Random.Range(0, 3);
          NetworkClient.Instance.LastSpawner.SpawnForPlayer(0, spawnPointIndex);
          NetworkClient.Instance.LastSpawner.PlayerFinishedSceneSetup();
      }
  }