Banner Ad won't load unless left in default position. Ads 4.3.0

My banner ad will only load if I leave it at default (TOP_LEFT)
If I tell it to go BOTTOM_CENTER, I get this error in logcat:

java.lang.ClassNotFoundException: com.unity3d.services.banners.view.BannerPosition

One suggestion was to use 3.7.5, but it fails to initialize.
Here’s the code I use in 4.3.0

using UnityEngine;
using UnityEngine.Advertisements;
using System.Collections;
    
public class AdsInitializer : MonoBehaviour, IUnityAdsInitializationListener
{
    [SerializeField] string _androidGameId;
    [SerializeField] string _iOSGameId;
    [SerializeField] bool _testMode = true;
    private string _gameId;
    [SerializeField] string _androidAdUnitId = "Banner_Android";
    [SerializeField] string _iOSAdUnitId = "Banner_iOS";
    [SerializeField] BannerPosition _bannerPosition;
    string _adUnitId = null;

    void Awake()
    {
        if (PlayerPrefs.GetString("Remove Banner Ad") != "Purchased")
        {
            Debug.Log("Remove Banner Ad not Purchased. This message is in the AdsInitializer script attached to Load and Show Banner Ad");
            InitializeAds();
        }
            else
        {
            Debug.Log("Remove Banner Ad Purchased. Ads not initialized.");
        }
    }

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

    public void OnInitializationComplete()
    {
        Debug.Log("OnInitializationComplete called.");
        LoadBanner();                    
    }

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

    IEnumerator InitializeAgain()
    {
        yield return new WaitForSeconds(1);
        InitializeAds();
        Debug.Log("Waited 1s then initialized again");
    }

    void Start()
    {
        // Get the Ad Unit ID for the current platform:
#if UNITY_IOS
        //_adUnitId = _iOSAdUnitId;
#elif UNITY_ANDROID
        _adUnitId = _androidAdUnitId;
#endif    
        Advertisement.Banner.SetPosition(_bannerPosition);
    }

    public void LoadBanner()
    {
        // Set up options to notify the SDK of load events:
        BannerLoadOptions options = new BannerLoadOptions
        {
            loadCallback = OnBannerLoaded,
            errorCallback = OnBannerError
        };

        // Load the Ad Unit with banner content:
        Advertisement.Banner.Load(_adUnitId, options);
    }

    void OnBannerLoaded()
    {
        Debug.Log("Banner loaded");
        ShowBannerAd();
    }

    void OnBannerError(string message)
    {
        Debug.Log($"Banner Error: {message}");            
    }

    void ShowBannerAd()
    {
        Advertisement.Banner.Show(_adUnitId);
    }

}

same here, I set it to center, but it wont show, after I go to another app and return to game, it’s apear on TopLeft and shows UNITYADS image, not AD… It is strange twice, because test mode is off xD