Ad Placements RewardAds cannot load

Unity Engine
1

Hi! I’m trying to follow the google Ad Placement official tutorial. the banner looks working but Reward ads always has problem. Ad Placement named ContinueRewardedAd does not exist.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds.Api;
using GoogleMobileAds.Placement;
public class TempButton : MonoBehaviour
{
    List<string> deviceIds = new List<string>();
    RewardedAdGameObject RewardAds;
    void Start()
    {
        RewardAds = MobileAds.Instance.GetAd<RewardedAdGameObject>("ContinueRewardedAd");
        RewardAds.LoadAd();
        this.gameObject.SetActive(false);
        deviceIds.Add("2077ef9a63d2b398840261c8221a0c9b");
        RequestConfiguration requestConfiguration = new RequestConfiguration.Builder().SetTestDeviceIds(deviceIds).build();
        MobileAds.SetRequestConfiguration(requestConfiguration);
        MobileAds.Initialize((initStatus) => {
            Debug.Log("Initialized MobileRewardAds");

        });


    }
}

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2 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds.Api;
using GoogleMobileAds.Placement;
public class TempButton : MonoBehaviour
{
    List<string> deviceIds = new List<string>();
 
     RewardedAdGameObject rewardedAdGameObject = MobileAds.Instance
    .Get<RewardedAdGameObject>("ContinueRewardedAd");
     RewardedAd rewardedAd = rewardedAdGameObject.RewardedAd;
    void Start()
    {
      
        rewardedAd.LoadAd();
        this.gameObject.SetActive(false);
        deviceIds.Add("2077ef9a63d2b398840261c8221a0c9b");
        RequestConfiguration requestConfiguration = new RequestConfiguration.Builder().SetTestDeviceIds(deviceIds).build();
        MobileAds.SetRequestConfiguration(requestConfiguration);
        MobileAds.Initialize((initStatus) => {
            Debug.Log("Initialized MobileRewardAds");

        });


    }
}