Unity 广告在真实设备上不起作用

Question

在我当前的 Unity 程序中，我想实现广告。当我运行游戏时，广告会在 Unity 编辑器中运行，但是当我尝试在 iPhone 7 或 iPad Air 上运行广告时，却没有广告出现。有人知道我做错了什么吗？using UnityEngine;using UnityEngine.SceneManagement;using UnityEngine.Advertisements;public class GameManager : MonoBehaviour{void Start(){    Advertisement.Initialize("Appstore-id");}bool gameHasEnded = false;public float restartDelay = 1f;public float addDelay = 1f;public GameObject completeLevelUI;public void CompleteLevel (){    completeLevelUI.SetActive(true);    Invoke("ShowAdd", addDelay);}public void EndGame(){    if (gameHasEnded == false)    {        gameHasEnded = true;        Debug.Log("Game over");        Invoke("Restart", restartDelay);    }}public void ShowAdd(){    if (Advertisement.IsReady())    {        Advertisement.Show ();    }}void Restart(){    SceneManager.LoadScene(SceneManager.GetActiveScene().name);}}