Teams were not set

Code (Java):

public class ScoreboardManager{
   
    public static void registerScoreboard(Player p) {
        Scoreboard board = Bukkit.getScoreboardManager().getNewScoreboard();
       
        org.bukkit.scoreboard.Team teamBlue = board.registerNewTeam("TeamBlue");
        org.bukkit.scoreboard.Team teamRed = board.registerNewTeam("TeamRed");
        org.bukkit.scoreboard.Team teamYellow = board.registerNewTeam("TeamYellow");
        org.bukkit.scoreboard.Team teamGreen = board.registerNewTeam("TeamGreen");
       
        teamBlue.setPrefix(ChatColor.AQUA.toString() + "§bBLUE ");
        teamRed.setPrefix(ChatColor.RED.toString() + "§cRED ");
        teamYellow.setPrefix(ChatColor.YELLOW.toString() + "§eYELLOW ");
        teamGreen.setPrefix(ChatColor.GREEN.toString() + "§aGREEN ");
       
        if(Team.getTeam(p) == BlockGame.blueTeam) {
            teamBlue.addEntry(p.getName());
           
        }else if(Team.getTeam(p) == BlockGame.redTeam) {
            teamRed.addEntry(p.getName());
        }else if(Team.getTeam(p) == BlockGame.yellowTeam) {
            teamYellow.addEntry(p.getName());
        }else if(Team.getTeam(p) == BlockGame.greenTeam) {
            teamGreen.addEntry(p.getName());
        }
       
        for(Player all : Bukkit.getOnlinePlayers()) {
            all.setScoreboard(board);
        }
       
    }
   

}

Code (Java):

public static void assignTeam(Player p) {
        ArrayList<Team> teamList = new ArrayList<>(Arrays.asList(blueTeam,redTeam));
        int teamLimit = (int) Math.ceil((GameManager.alivePlayer.size() / 2.0));
        for(Player alive : GameManager.alivePlayer) {
            int teamNumber = Randomizer.getRandomInt(teamList.size() - 1);
            Team.addPlayers(teamList.get(teamNumber), alive);
            if(Team.getTeamAmount(teamList.get(teamNumber)) >= teamLimit) {
                teamList.remove(teamList.get(teamNumber));
            }
            Bukkit.broadcastMessage(Team.playerTeams.get(alive.getName()).teamColor + " " + alive.getName());
        }
        for(Player all : Bukkit.getOnlinePlayers()) {
            ScoreboardManager.registerScoreboard(all);
        }
        setUP(p);
    }