OnJoinedLobby not seem to being called?

Calling PhotonNetwork.ConnectUsingSettings() works perfectly. The console clearly prints that it connects to the US-Server. Auto-Join Lobby is indeed, enabled, however my PhotonNet(implements Photon.PunBehaviour) does not call
public override void OnJoinedLobby().
It simply will not call! I have it overridden, and have it printing to the console, but it won't print.
Any suggestions? Thanks!