AdMob not working rewarded add re-view?

Question

Unity

In general, the game has three resurrections with the help of ads when I view ads -=1. When attempts == 0 the ad button becomes inactive. But after the first resurrection, the second does not work. advertising script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using GoogleMobileAds.Api;

public class AdsMobReward : MonoBehaviour
{
    private string RewardedUnitId = "ca-app-pub-3940256099942544/5224354917";
    private RewardedAd rewardedAd;
    public Button showAd;

    public void OnEnable()
    {
        rewardedAd = new RewardedAd(RewardedUnitId);
        AdRequest adRequest = new AdRequest.Builder().Build();
        rewardedAd.LoadAd(adRequest);
        rewardedAd.OnUserEarnedReward += HandleUserEarnedReward;
    }
    private void HandleUserEarnedReward(object sender, Reward e)
    {
        int mon = PlayerPrefs.GetInt("Money");
        int gold = PlayerPrefs.GetInt("Gold");
        int life = PlayerPrefs.GetInt("LifeCount");
        mon += 20;
        gold += 1;
        life -= 1;
        PlayerPrefs.SetInt("Video",1);
        PlayerPrefs.SetInt("Money",mon);
        PlayerPrefs.SetInt("Gold",gold);
        PlayerPrefs.SetInt("LifeCount",life);       
    }
    public void Update(){
            int life = PlayerPrefs.GetInt("Life");
            if(life != 0 && life > 0){
                showAd.interactable = true;
            }
            else if(life == 0 && life < 0) showAd.interactable = false;
    }
    public void ShowAd()
    {
        if (rewardedAd.IsLoaded()){
            rewardedAd.Show();
        }
            
    }
}

Answer 1

After viewing the ad, you need to download it again using the following lines of code:

rewardedAd = new RewardedAd(RewardedUnitId);
AdRequest adRequest = new AdRequest.Builder().Build();
rewardedAd.LoadAd(adRequest);

Otherwise, the new promotional video will not be uploaded and the check rewardedAd.IsLoaded()will return false.