1.8.8 Set specific player flying in survival?

I can't set player with permission nfn.fly flying in specific world.

What I tried :
(Class is registered and messages are working as they should)

Code (Java):

import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerChangedWorldEvent;

public class LobbyJoin implements Listener
{
    MainClass plugin;

    LobbyJoin(MainClass plugin)
    {
        this.plugin = plugin;
    }
 
    @EventHandler
    public void onJoin(PlayerJoinEvent e)
    {
        if((e.getPlayer().hasPermission("nfn.fly") || e.getPlayer().isOp()) && e.getPlayer().getWorld().getName().equals("lobby") && !e.getPlayer().isFlying())
        {
            e.getPlayer().setAllowFlight(true);
            e.getPlayer().sendMessage("set allow flight true");
            e.getPlayer().setFlying(true);
            e.getPlayer().sendMessage("set flying true");
        }
        else
        {
            e.getPlayer().setAllowFlight(false);
            e.getPlayer().sendMessage("set allow flight false");
            e.getPlayer().setFlying(false);
            e.getPlayer().sendMessage("set flying false");
        }
    }
    @EventHandler
    public void onChangeWorld(PlayerChangedWorldEvent e)
    {
        if(e.getPlayer().getWorld().getName().equals("lobby"))
        {
            e.getPlayer().setAllowFlight(true);
            e.getPlayer().sendMessage("set allow flight true");
            e.getPlayer().setFlying(true);
            e.getPlayer().sendMessage("set flying true");
        }
        else
        {
            e.getPlayer().setAllowFlight(false);
            e.getPlayer().sendMessage("set allow flight false");
            e.getPlayer().setFlying(false);
            e.getPlayer().sendMessage("set flying false");
        }
    }
}

 

Alright. Problem was with Multiverse ('allow-flight' was set to false in world 'lobby'). Code is working fine.