Room list returns count of 0

Hi! My goal is to get a room list with a second LoadBalancingClient while already in a room. I'm using PUN2 and latest Unity. After creating a public and with lobby-exposed-properties room like this (and giving it many seconds to exist, so no racing)...

Hashtable properties = new Hashtable();
properties.Add(RoomProperty.Name.ToString(), "Welcome Island X");
properties.Add(RoomProperty.Scene.ToString(), Scene.Island);
        
string[] lobbyExposedProperties = new string[]
{
    RoomProperty.Name.ToString(),
    RoomProperty.Scene.ToString(),
};
        
RoomOptions options = new RoomOptions();
options.MaxPlayers = (byte) 8;
options.IsVisible = true;
options.IsOpen = true;
        
options.CustomRoomProperties = properties;
options.CustomRoomPropertiesForLobby = lobbyExposedProperties;
        
PhotonNetwork.CreateRoom(null, options);

... and then creating the secondary LoadBalancingClient like this (note I'm restricting to "us" in all region settings, also in the dashboard and PUN highlight settings) ...

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Photon.Pun;
using Photon.Realtime;
using ExitGames.Client.Photon;

public class PhotonRoomPoller : MonoBehaviourPunCallbacks, ILobbyCallbacks
{
    Action callback = null;
    LoadBalancingClient client = null;

    public void GetRoomsInfo(Action callback)
    {
        this.callback = callback;
        
        Debug.Log("Starting LoadBalancingClient...");
        client = new LoadBalancingClient(PhotonNetwork.NetworkingClient.ExpectedProtocol);
        client.AddCallbackTarget(this);
        client.StateChanged += OnStateChanged;
        client.AppId = PhotonNetwork.PhotonServerSettings.AppSettings.AppIdRealtime;
        client.EnableLobbyStatistics = true;
        client.ConnectToRegionMaster("us");

        // if (callback != null) { callback("Hello World"); }
    }

    void Update()
    {
        if (client != null)
        {
            client.Service();
        }
    }

    void OnStateChanged(ClientState previousState, ClientState state)
    {
        switch (state)
        {
            case ClientState.ConnectedToMaster:
                Debug.Log("*** ConnectedToMaster");
                client.OpJoinLobby(null);
                break;
                
            case ClientState.JoinedLobby:
                Debug.Log("*** JoinedLobby");
                break;
        }
    }
    
    public override void OnRoomListUpdate(List infos)
    {
        Debug.Log("*** OnRoomListUpdate");
        Debug.Log("Room count: " + infos.Count); // XXX
        foreach (RoomInfo info in infos)
        {
            Debug.Log(info);
        }
    }

}

... I'm getting a rooms count of 0 where it says XXX, even though the proper order of ConnectedToMaster - JoinedLobby is called before, and InLobby is true at the time of checking. What to do? Thanks!