Unable to Show Admob ads | Development Build

Hello Guys,

I would like to ask for advice. I am able to see the admob ads in my emulator and also with real device, if in my Build Settings the Development Build is Checked.

But if not, no Ads at all.

Will it be okay to build an APK to be released in Google Play Store even if the Development Build is checked?

Sorry I'm new in Unity.

The Code:

 using UnityEngine;
 using System.Collections;
 using GoogleMobileAds.Api;
 
 public class AdScript : MonoBehaviour
 {
 
     bool isShown;
     InterstitialAd interstitial;
 
     void Start()
     {
         
         RequestInterstitialAds();
     }
 
     void Update()
     {
         if (GameControl.isGameOver)
         {
             if (!isShown)
             {
                 isShown = true;
                 showInterstitialAd();
             }
         }
     }
 
     public void showInterstitialAd()
     {
         
         if (interstitial.IsLoaded())
         {
             interstitial.Show();
             
         }
 
     }
 
     
     private void RequestInterstitialAds()
     {
         //Testing
         string adID = "ca-app-pub-3940256099942544/1033173712";
 
         //Live
         //string adID = "MY ADD ID";                     
 
         #if UNITY_ANDROID
         string adUnitId = adID;
         #elif UNITY_IOS
         string adUnitId = adID;
         #else
         string adUnitId = adID;
         #endif
             
         // Initialize an InterstitialAd.
         interstitial = new InterstitialAd(adUnitId);
 
         //Test
         AdRequest request = new AdRequest.Builder()
         .AddTestDevice(AdRequest.TestDeviceSimulator)       // Simulator.
         .AddTestDevice("89D1DA1F820CE28BA86223A1C34****")  // My test device.
         .Build();
 
         //Production
         //AdRequest request = new AdRequest.Builder().Build();
 
         //Register Ad Close Event
         interstitial.OnAdClosed += Interstitial_OnAdClosed;
 
         //Load the interstitial with the request.
         interstitial.LoadAd(request);
 
         //Debug.Log("AD LOADED XXX");
 
     }
 
     
     private void Interstitial_OnAdClosed(object sender, System.EventArgs e)
     {
     //Resume Play Sound
     }
 }
 

Thanks in advance.