Plugin Help Scoreboard isn't working

Code:

    private Scoreboard board;
    Objective o;
   
    public void setup() {
        board = Bukkit.getServer().getScoreboardManager().getNewScoreboard();
       
        o = board.registerNewObjective("money", "dummy");
        o.setDisplayName("R");
        o.setDisplaySlot(DisplaySlot.SIDEBAR);
    }
   
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e) {
        Player p = e.getPlayer();
       
        p.setScoreboard(board);
       
       
    }
   
   
}

Setup is being called in Main class.