iOS ADMOB Reward based video ad failed to load

问题

until today I was able to show the reward video, but now the video doesn't appear, a log of admod alert me to install the new

ADMOB SDK 7.23.0

Now with the new ADMOB SDK the reward video fails to load.

with the test id, seems to work:

GADRewardBasedVideoAd.sharedInstance().load(GADRequest(),withAdUnitID: "ca-app-pub-3940256099942544/1712485313")

if I change with my reference ID, the video fails to load. I've also added in AppDelegate:

//ADMOB
import GoogleMobileAds

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        //ADMOB
        GADMobileAds.configure(withApplicationID: AppConfiguration.AdMob.ID_APP)
        return true
}