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我正在尝试向我的应用添加奖励 AdMob 视频我在 onCreate 中的代码是

Android.Gms.Ads.MobileAds.Initialize(ApplicationContext, "APP_CODE" );
mRewardedVideoAd = MobileAds.GetRewardedVideoAdInstance(this);
mRewardedVideoAd.RewardedVideoAdListener = this;
mRewardedVideoAd.LoadAd(@"ca-app-pub-3940256099942544/5224354917",
                    new AdRequest.Builder().Build());

当我尝试通过以下代码显示视频时

if (mRewardedVideoAd.IsLoaded)
                mRewardedVideoAd.Show();

mRewardedVideoAd.IsLoaded 总是返回 false

有什么解决方案吗?

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