Problem with PUN and Playfab

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Photon;
using PlayFab;
using PlayFab.ClientModels;
using UnityEngine;
using UnityEngine.UI;

public class PhotonLauncher : PunBehaviour {

    private bool isConnecting;
    private string gameVersion = "1";
    public Text txtProcess;
    public InputField txtName;
    private static string playerPrefNameKey = "PlayerName";

    //playfab example

    private string _playFabPlayerIdCache;

    [Tooltip("The maximum number of players per room")]
    public byte maxPlayersPerRoom = 4;
    void Awake() {
        PhotonNetwork.autoJoinLobby = false;
        PhotonNetwork.automaticallySyncScene = true;
    }

    public void Connect() {
        isConnecting = true;
        if (PhotonNetwork.connected) {
            showLog("Joining room...");
            PhotonNetwork.JoinRandomRoom();
            PhotonNetwork.JoinRandomRoom(null, (byte)4);
        }
        else {
            showLog("Connecting...");
            PhotonNetwork.ConnectUsingSettings(gameVersion);
        }
    }

 

    public void Start() {
        string defaultName = "";
        if (PlayerPrefs.HasKey(playerPrefNameKey)) {
            defaultName = PlayerPrefs.GetString(playerPrefNameKey);
            txtName.text = defaultName;
        }
        PhotonNetwork.playerName = defaultName;
    }

    public void OnBtnConnect() {
        string name = txtName.text;
        PhotonNetwork.playerName = name + " ";
        PlayerPrefs.SetString(playerPrefNameKey, name);
        AuthenticateWithPlayFab(name);
        Connect();
    }

    public void showLog(string message) {
        txtProcess.text = message;
    }

    public override void OnConnectedToMaster() {
        showLog("Connected to region: " + PhotonNetwork.networkingPeer.CloudRegion);

        if (isConnecting) {
            showLog("OnConnectedToMaster: Next -> try to Join Random Room");
            Debug.Log("DemoAnimator/Launcher: OnConnectedToMaster() was called by PUN. Now this client is connected and could join a room.\n Calling: PhotonNetwork.JoinRandomRoom(); Operation will fail if no room found");
            PhotonNetwork.JoinRandomRoom();
        }
    }

    public override void OnPhotonRandomJoinFailed(object[] codeAndMsg) {
        showLog("<Color=Red>OnPhotonRandomJoinFailed</Color>: Next -> Create a new Room");
        Debug.Log("DemoAnimator/Launcher:OnPhotonRandomJoinFailed() was called by PUN. No random room available, so we create one.\nCalling: PhotonNetwork.CreateRoom(null, new RoomOptions() {maxPlayers = 4}, null);");

        PhotonNetwork.CreateRoom(null, new RoomOptions() { MaxPlayers = this.maxPlayersPerRoom }, null);
    }

    public override void OnDisconnectedFromPhoton() {
        showLog("<Color=Red>OnDisconnectedFromPhoton</Color>");
        Debug.LogError("DemoAnimator/Launcher:Disconnected");

        isConnecting = false;

    }
    public override void OnJoinedRoom() {
        showLog("<Color=Green>OnJoinedRoom</Color> with " + PhotonNetwork.room.PlayerCount + " Player(s)");
        Debug.Log("DemoAnimator/Launcher: OnJoinedRoom() called by PUN. Now this client is in a room.\nFrom here on, your game would be running. For reference, all callbacks are listed in enum: PhotonNetworkingMessage");

        if (PhotonNetwork.room.playerCount > 1) {
            PhotonNetwork.LoadLevel("GamePlay1");
        }
    }
    public override void OnPhotonPlayerConnected(PhotonPlayer other) {
        Debug.Log("OnPhotonPlayerConnected() " + other.NickName); // not seen if you're the player connecting
        if (PhotonNetwork.isMasterClient) {
            Debug.Log("OnPhotonPlayerConnected isMasterClient " + PhotonNetwork.isMasterClient); // called before OnPhotonPlayerDisconnected
            if (PhotonNetwork.room.PlayerCount > 1)
                LoadArena();
        }
    }

    void LoadArena() {
        if (!PhotonNetwork.isMasterClient) {
            Debug.LogError("PhotonNetwork : Trying to Load a level but we are not the master Client");
        }

        Debug.Log("PhotonNetwork : Loading Level : " + PhotonNetwork.room.PlayerCount);

        PhotonNetwork.LoadLevel("GamePlay1");
    }

    #region Playfab
    private void AuthenticateWithPlayFab(string text) {
        LogMessage("PlayFab authenticating using Custom ID..." + text);

        PlayFabClientAPI.LoginWithCustomID(new LoginWithCustomIDRequest() {
            CreateAccount = true,
            CustomId = text
        }, RequestPhotonToken, OnPlayFabError);
    }
    
    private void RequestPhotonToken(LoginResult obj) {
        LogMessage("PlayFab authenticated. Requesting photon token...");

        //We can player PlayFabId. This will come in handy during next step
        _playFabPlayerIdCache = obj.PlayFabId;

        PlayFabClientAPI.GetPhotonAuthenticationToken(new GetPhotonAuthenticationTokenRequest() {
            PhotonApplicationId = PhotonNetwork.PhotonServerSettings.AppID
        }, AuthenticateWithPhoton, OnPlayFabError);
    }
    
    private void AuthenticateWithPhoton(GetPhotonAuthenticationTokenResult obj) {
        LogMessage("ID: " + _playFabPlayerIdCache + " Photon token acquired: " + obj.PhotonCustomAuthenticationToken + "  Authentication complete.");
        
        var customAuth = new AuthenticationValues { AuthType = CustomAuthenticationType.Custom };
        
        customAuth.AddAuthParameter("username", _playFabPlayerIdCache);    // expected by PlayFab custom auth service
        
        customAuth.AddAuthParameter("token", obj.PhotonCustomAuthenticationToken);
        
        PhotonNetwork.AuthValues = customAuth;
    }

    private void OnPlayFabError(PlayFabError obj) {
        LogMessage(obj.GenerateErrorReport());
    }

    public void LogMessage(string message) {
        Debug.Log("PlayFab + Photon Example: " + message);
    }


    #endregion

}