Spawn prefabs according to player platform with LobbyManager

I'm trying to spawn different prefabs depending on the player platform. So I'm overriding the NetworkLobbyManager to spawn objects the way I want. So I create a Dictionnary that associates a connectionId to an index of a prefab and then I instantiate a prefab according to this index.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Networking;
 
 public class LobbyManager : NetworkLobbyManager
 {
     private Dictionary<int, int> m_currentPlayers;
 
     void Start()
     {
         m_currentPlayers = new Dictionary<int, int>();
     }
 
     void AddPlayer(NetworkConnection conn)
     {
         if (Application.platform == RuntimePlatform.WindowsEditor || Application.platform == RuntimePlatform.WindowsPlayer)
         {
             m_currentPlayers.Add(conn.connectionId, 0);
         }
         else if (Application.platform == RuntimePlatform.Android)
         {
             m_currentPlayers.Add(conn.connectionId, 1);
         }
     }
 
     public override GameObject OnLobbyServerCreateLobbyPlayer(NetworkConnection conn, short playerControllerId)
     {
         AddPlayer(conn);
 
         return base.OnLobbyServerCreateLobbyPlayer(conn, playerControllerId);
     }
 
     public override GameObject OnLobbyServerCreateGamePlayer(NetworkConnection conn, short playerControllerId)
     {
         GameObject go = Instantiate(spawnPrefabs[m_currentPlayers[conn.connectionId]]);
         NetworkServer.AddPlayerForConnection(conn, go, playerControllerId);
 
         return go;
     }
 }

But with this code the spawn player on the clients is always the same as the host and I don't know why because it seems like I'm overriding the correct functions and I saw here http://abrgame.blogspot.fr/2016/01/using-unet-to-spawn-different-player.html a guy who used the same technique and that works for him...