使用Google Mobile Ads v6.0.2的Unity奖励Interstitialv6.0.2-教程中的代码不起作用

using Google.MobileAds;
using UnityEngine;

public class AdManager : MonoBehaviour
{
    private InterstitialAd interstitial;

    void Start()
    {
        MobileAds.Initialize(initStatus => { });
        RequestInterstitial();
    }

    void RequestInterstitial()
    {
        string adUnitId = "YOUR_AD_UNIT_ID";
        interstitial = new InterstitialAd(adUnitId);
        AdRequest request = AdRequest.Build();
        interstitial.LoadAd(request);

        interstitial.OnAdLoaded += OnInterstitialLoaded;
        interstitial.OnAdFailedToLoad += OnInterstitialFailedToLoad;
    }

    void OnInterstitialLoaded()
    {
        if (interstitial.IsReady)
        {
            interstitial.Show();
        }
    }

    void OnInterstitialFailedToLoad(AdError adError)
    {
        Debug.LogError($"Interstitial ad failed to load: {adError.Message}");
    }
}