Question Start Event For Client Lobby after Lobby State change from Host user

Hello! I want show lobby window and countdown after all players push ready button. So I receive info in event callbacks when user push ready. But I want that only host check

Code (CSharp):

1. private void OnPlayersReady(int readyCount)
2. {
3.     if (readyCount == _localLobby.MaxPlayerCount.Value && _localLobby.LocalLobbyState.Value != LobbyState.CountDown)
4.     {
5.         _localLobby.LocalLobbyState.Value = LobbyState.CountDown;
6.         SendLocalLobbyData();
7.     }
8.     else if (_localLobby.LocalLobbyState.Value == LobbyState.CountDown)
9.     {
10.         _localLobby.LocalLobbyState.Value = LobbyState.Lobby;
11.         SendLocalLobbyData();
12.     }
13. }
14.  
15. private async void SendLocalLobbyData()
16. {
17.     await _lobbyManager.UpdateLobbyDataAsync(LobbyConverters.LocalToRemoteLobbyData(_localLobby));
18. }

So after users join to lobby they bind to lobby updates, code below

Code (CSharp):

1. private async Task BindLobby()
2.     {
3.         await _lobbyManager.BindLocalLobbyToRemote(_localLobby.LobbyID.Value, _localLobby);
4.         _localLobby.LocalLobbyState.onChanged += OnLobbyStateChanged;
5.     }

And we have

Code (CSharp):

1. private void OnLobbyStateChanged(LobbyState state)
2.     {
3.         switch (state)
4.         {
5.             case LobbyState.Lobby:
6.                 CancelCountDown();
7.                 break;
8.             case LobbyState.CountDown:
9.                 SetGameState(GameState.Lobby);
10.                 BeginCountDown(); // here
11.                 break;
12.             case LobbyState.InGame:
13.                 _localUser.UserStatus.Value = PlayerStatus.InGame;
14.                 break;
15.         }
16.     }

I don't understand why my clients doesn't see changed lobby state and BeginCountDown() from last code sample don't call. Can anyone help me?