Help with Teams

I'm trying to add a Prefix to a Scoreboard team but it seems that it won't work for some reason and I have no clue why. This is the code I'm using

Code (open) Code (close)

Code:

Scoreboard sc = Bukkit.getScoreboardManager().getMainScoreboard();
                    Team team1 = sc.getTeam("Owner");
                    if(team1 == null) {
                        team1 = sc.registerNewTeam("Owner");
                    }
                    team1.setPrefix(ChatColor.translateAlternateColorCodes('&', "&a[Prefix]"));
                    team1.addPlayer(p.getPlayer());
                    p.sendMessage("§7§oYour rank has been undated to §bOwner");

and this is how it looks like ingame

Image (open) Image (close)

 

Whats the rest of the event/whatever. I cant see the message "your rank...". Do you receive that message? Or where is your piece of code from?

 

@MightyOne This is the code from my onJoin

Code:

if (p.hasPermission("skyline.owner")) {
                    Scoreboard sc = Bukkit.getScoreboardManager().getMainScoreboard();
                    Team team1 = sc.getTeam("Owner");
                    if(team1 == null) {
                        team1 = sc.registerNewTeam("Owner");
                    }
                    team1.setPrefix(ChatColor.translateAlternateColorCodes('&', "&a[Prefix]"));
                    team1.addPlayer(p.getPlayer());
                    p.sendMessage("§7§oYour rank has been undated to §bOwner");

                } else if (p.hasPermission("skyline.admin")) {
                    p.setPlayerListName("§8(§6Admin§8)§7 " + p.getName());
                    p.sendMessage("§7§oYour rank has been undated to §bAdmin");

                } else if (p.hasPermission("skyline.cm")) {
                    p.setPlayerListName("§8(§3Cast Member§8)§7 " + p.getName());
                    p.sendMessage("§7§oYour rank has been undated to §bCM");

                } else if (p.hasPermission("skyline.cp")) {
                    p.setPlayerListName("§8(§bIntern§8)§7 " + p.getName());
                    p.sendMessage("§7§oYour rank has been undated to §bCP");

                } else if (p.hasPermission("skyline.beta")) {
                    p.setPlayerListName("§8(§bBeta§8)§7 " + p.getName());
                    p.sendMessage("§7§oYour rank has been undated to §bBeta");

                } else {
                    p.setPlayerListName("§7" + p.getName());
                    p.sendMessage("§7§oYour rank has been undated to §bGuest");

                }