Scoreboard prefixes not displaying.

I am having an issue with the prefixes of a scoreboard team not displaying. This is in the 1.7.10 protocol. Here is the code:

Code:

package com.mcduels.prefix;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.permissions.Permission;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scoreboard.Scoreboard;
import org.bukkit.scoreboard.Team;

public class Main extends JavaPlugin implements Listener {
   
    public Permission command = new Permission("mcduels.prefix.command");
    public Permission owner = new Permission("mcduels.prefix.owner");
    public Permission admin = new Permission("mcduels.perefix.admin");
    public Permission dev = new Permission("mcduels.prefix.dev");
    public Permission srmod = new Permission("mcduels.prefix.srmod");
    public Permission mod = new Permission("mcduels.prefix.mod");
    public Permission yt = new Permission("mcduels.prefix.yt");
    public Permission premium = new Permission("mcduels.prefix.premium");
    public Permission deluxe = new Permission("mcduels.prefix.deluxe");
   
   
   
    private Scoreboard rank;
   
    private Team ownerrank;
    private Team premiumrank;
    private Team adminrank;
    private Team devrank;
    private Team srmodrank;
    private Team modrank;
    private Team deluxerank;
    private Team op;
    private Team ytrank;
   
   
   
   
   
    @Override
    public void onEnable() {
       
        getLogger().info("Creating scoreboard...");
        rank = Bukkit.getScoreboardManager().getNewScoreboard();
        getLogger().info("Registering Ranks...");
       

       
        ownerrank = rank.registerNewTeam("owner");
        premiumrank = rank.registerNewTeam("premium");
        adminrank = rank.registerNewTeam("admin");
        devrank = rank.registerNewTeam("dev");
        srmodrank = rank.registerNewTeam("srmod");
        modrank = rank.registerNewTeam("mod");
        deluxerank = rank.registerNewTeam("deluxe");
        op = rank.registerNewTeam("op");
        ytrank = rank.registerNewTeam("yt");
       
       
       
        getLogger().info("Registering events...");
        this.getServer().getPluginManager().registerEvents(this,this);
       
        getLogger().info("Setting Prefixes...");
       
        String ownerprefix = ChatColor.RED+"Owner"+ChatColor.WHITE;
       
        String opprefix= ChatColor.DARK_RED+"Op"+ChatColor.WHITE;
        String adminprefix =ChatColor.RED+"Admin"+ChatColor.WHITE;
        String devprefix=ChatColor.YELLOW+"Dev"+ChatColor.WHITE;
        String srmodprefix=ChatColor.DARK_PURPLE+"Sr.Mod"+ChatColor.WHITE;
        String modprefix=ChatColor.DARK_PURPLE+"Mod"+ChatColor.WHITE;
        String deluxeprefix=ChatColor.GOLD+"✪"+ChatColor.YELLOW;
        String ytprefix=ChatColor.RED+"You"+ChatColor.DARK_RED+"Tube";
        String premiumprefix=ChatColor.BLUE+"✯"+ChatColor.DARK_AQUA;   
        ownerrank.setPrefix(ownerprefix);
       
        op.setPrefix(opprefix);
       
       
       
        adminrank.setPrefix(adminprefix);
       
        devrank.setPrefix(devprefix);
       
        srmodrank.setPrefix(srmodprefix);
       
        modrank.setPrefix(modprefix);
       
        deluxerank.setPrefix(deluxeprefix);
       
        ytrank.setPrefix(ytprefix);
       
        premiumrank.setPrefix(premiumprefix);
       
       
        getLogger().info("Updating ranks...");
        this.updateRanks();
       
        getLogger().info("Successful initalization!");
       
    }
   
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(cmd.getName().equalsIgnoreCase("rankreload")) {
            if(!sender.hasPermission("")) {
                sender.sendMessage(ChatColor.WHITE+"You do not have permission to do this!");
                return true;
           
            }
           
            else {
                this.updateRanks();
                sender.sendMessage(ChatColor.WHITE+"Ranks have been reloaded.");
                return true;
            }
        }
       
        return false;
       
    }
   
   
    @SuppressWarnings("deprecation")
    private void updateRanks() {
        for(Player p : Bukkit.getServer().getOnlinePlayers()) {
            if(p.isOp()) {
                op.addPlayer(p);
                return;
            }
           
            else if(p.hasPermission(owner)) {
               
               
                ownerrank.addPlayer(p);
                return;
            }
            else if(p.hasPermission(admin)) {
                adminrank.addPlayer(p);
                return;
            }
            else if(p.hasPermission(dev)) {
                devrank.addPlayer(p);
            }
            else if(p.hasPermission(srmod)) {
                srmodrank.addPlayer(p);
                return;
            }
            else if(p.hasPermission(mod)) {
                modrank.addPlayer(p);
                return;
            }
       
            else if(p.hasPermission(yt)) {
                ytrank.addPlayer(p);
                return;
            }
            else if(p.hasPermission(premium)) {
                premiumrank.addPlayer(p);
                return;
            }
            else if(p.hasPermission(deluxe)) {
                deluxerank.addPlayer(p);
                return;
            }
            else {
                return;
               
               
            }
            p.setScoreboard(rank);
           
           
           
        }
       
    }
   
   
   

   
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e)  {
        Player p = e.getPlayer();
        p.setScoreboard(rank);
        this.updateRanks();
       
    }
   
   

}

NOTE: The ranks are hard-coded for a reason.