Upgrade from PUN to PUN 2

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Hi

We are in the process of upgrading our project from PUN to PUN 2.
We are not receiving callbacks.

Code:

public override void OnCreatedRoom()
{
roomOwner = true;
GameManager.Instance.roomOwner = true;
Debug.Log("OnCreatedRoom");
}

and we are using these interfaces:

public class PlayFabManager : MonoBehaviourPunCallbacks, IChatClientListener, IConnectionCallbacks, IInRoomCallbacks, IMatchmakingCallbacks
{

}

Yet, OnCreatedRoom() is not being triggered. Please help us step by step.

Thanks