My game Id Android doesnt work.

Hello, guys. I have a problem, when i use the test game id("1234567") mentioned in documentation on how to implement rewarded ads, it works perfectly, but when i use my game id for some reason the ad is never ready, regardless the test mode (same on and off.). Here is the code. Also, the project was created today, maybe that matters.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Advertisements;
 
 public class AdController : MonoBehaviour, IUnityAdsListener
 {
     string gameId = "4xxxxx1"; //my game id
     string mySurfacingId = "rewardedVideo";
     bool testMode = false;
     public SceneController scn;
 
     // Initialize the Ads listener and service:
     void Start () {
         Advertisement.AddListener (this);
         Advertisement.Initialize (gameId, testMode);
     }
 
     public void ShowRewardedVideo() {
         // Check if UnityAds ready before calling Show method:
         if (Advertisement.IsReady(mySurfacingId)) {
             Advertisement.Show(mySurfacingId);
         } 
         else {
             Debug.Log("Rewarded video is not ready at the moment! Please try again later!");
         }
     }
 
     // Implement IUnityAdsListener interface methods:
     public void OnUnityAdsDidFinish (string surfacingId, ShowResult showResult) {
         // Define conditional logic for each ad completion status:
         if (showResult == ShowResult.Finished)
         {
             scn.continueGame();
         } else if (showResult == ShowResult.Skipped) {
             // Do not reward the user for skipping the ad.
         } else if (showResult == ShowResult.Failed) {
             Debug.LogWarning ("The ad did not finish due to an error.");
         }
     }
 
     public void OnUnityAdsReady (string surfacingId) {
         // If the ready Ad Unit or legacy Placement is rewarded, show the ad:
         if (surfacingId == mySurfacingId) {
             // Optional actions to take when theAd Unit or legacy Placement becomes ready (for example, enable the rewarded ads button)
         }
     }
 
     public void OnUnityAdsDidError (string message) {
         // Log the error.
     }
 
     public void OnUnityAdsDidStart (string surfacingId) {
         // Optional actions to take when the end-users triggers an ad.
     } 
 
     // When the object that subscribes to ad events is destroyed, remove the listener:
     public void OnDestroy() {
         Advertisement.RemoveListener(this);
     }
 }