Unity Ads initialization not working.

I have a very simple problem. I gave my project an ID and I copied AdsInitialization script from Unity’s guide. I put that script to an empty game object and I wrote my Android and IOS game ID. When I start the game, I get nothing in the console and I should get something. Please help. This is the code I used:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Advertisements;

public class AdsInitializer : MonoBehaviour, IUnityAdsInitializationListener
{
    [SerializeField] string _androidGameId;
    [SerializeField] string _iOSGameId;
    [SerializeField] bool _testMode = true;
    private string _gameId;

    void Awake()
    {
        InitializeAds();
    }

    public void InitializeAds()
    {
        _gameId = (Application.platform == RuntimePlatform.IPhonePlayer)
            ? _iOSGameId
            : _androidGameId;
        Advertisement.Initialize(_gameId, _testMode, this);
    }

    public void OnInitializationComplete()
    {
        Debug.Log("Unity Ads initialization complete.");
    }

    public void OnInitializationFailed(UnityAdsInitializationError error, string message)
    {
        Debug.Log($"Unity Ads Initialization Failed: {error.ToString()} - {message}");
    }
}

Hello,

Did you run your code with Unity Editor or a mobile device?
If Unity Editor, please make sure your target platform is set to iOS or Android.