Google AdsMob doesn't appear on my app simulator swift

please I have a problem. I added GoogleAdsMob in my application but it doesn't appear anywhere. I used the code below, but so far nothing. Nevertheless it counts on the Google AdsMob side but nothing appears in my App. Does anyone have a solution?

import GoogleMobileAds
import UIKit
class ViewController: UIViewController, GADBannerViewDelegate {
/// The AdManager banner view.
@IBOutlet weak var bannerView: GAMBannerView!
override func viewDidLoad() {
super.viewDidLoad()
print("Google Mobile Ads SDK version: \(GADMobileAds.sharedInstance().sdkVersion)")
bannerView.adUnitID = "/6499/example/banner"
bannerView.rootViewController = self
bannerView.load(GAMRequest())
}
func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
print("bannerViewDidReceiveAd")
}
func bannerView(_ bannerView: GADBannerView, didFailToReceiveAdWithError error: Error) {
print("bannerView:didFailToReceiveAdWithError: \(error.localizedDescription)")
}
func bannerViewDidRecordImpression(_ bannerView: GADBannerView) {
print("bannerViewDidRecordImpression")
}
func bannerViewWillPresentScreen(_ bannerView: GADBannerView) {
print("bannerViewWillPresentScreen")
}
func bannerViewWillDismissScreen(_ bannerView: GADBannerView) {
print("bannerViewWillDIsmissScreen")
}
func bannerViewDidDismissScreen(_ bannerView: GADBannerView) {
print("bannerViewDidDismissScreen")
}
}

Update:

I also tried this code, but even then no result. It doesn't display anything and yet it compiles without any problem

class ViewController: UIViewController {

struct ContentView : View {
var body: some View {
VStack {
Text("Google Mobile Ads")
GADBannerViewController()
}
}
}

// MARK: - Setting Google View Mobile Ads

struct GADBannerViewController : UIViewControllerRepresentable{
func makeUIViewController(context: Context) -> some UIViewController {
let view = GADBannerView(adSize: GADAdSizeBanner)
let viewController = UIViewController()
let testID = "ca-app-pub-3940256099942544/2934735716"
view.adUnitID = testID
view.rootViewController = viewController
//
viewController.view.addSubview(view)
viewController.view.frame = CGRect(origin: .zero, size: GADAdSizeBanner.size)
//Load Ads
view.load(GADRequest())
//view.backgroundColor = .secondarySystemBackground
return viewController
}
Google AdsMob doesn't appear on my app simulator swift
 
 
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