HighGroundRoyaleNetcode/Assets/Scripts/TimerScript.cs

using System.Collections;
using Unity.Multiplayer.Samples.Utilities;
using Unity.Netcode;
using UnityEngine;

public class TimerScript : MonoBehaviour
{
    [SerializeField] private SynchronizedTimer timer;
    public ServerAdditiveSceneLoader serverAdditiveSceneLoader;
    public int timeInSeconds = 180;

    void Start()
    {
        if (timer != null)
        {
            timeInSeconds = 1200;
            timer.OnTimerEnd += HandleTimerEnd;
            Debug.Log("Timer started call sent");
            StartCoroutine(Starter());
        }
    }

    IEnumerator Starter()
    {
        yield return new WaitUntil(() => serverAdditiveSceneLoader.m_SceneState == ServerAdditiveSceneLoader.SceneState.Loaded);
        if (NetworkManager.Singleton.IsServer)
        {
            yield return new WaitForSeconds(2.5f);
            Debug.Log("Timer started call sent2");

            timer.StartTimerServer(timeInSeconds);
        }
    }

    private void HandleTimerEnd()
    {
        Debug.Log("Timer has ended!");
        Scoreboard.instance.FinalLeaderBoard();
    }

    private void OnDestroy()
    {
        if (timer != null)
        {
            timer.OnTimerEnd -= HandleTimerEnd;
        }
    }
}