Hi,
Please note that new test devices typically start serving test ads in your app within 15 minutes, but it can also take up to 24 hours. You can try adding your device programmatically as well.
If you are still facing the same issue even after 24hrs, kindly share below details via "Reply to author" option for further investigation:
Mobile Ads SDK Team |
GADMobileAds.sharedInstance().requestConfiguration.testDeviceIdentifiers = [ "2077ef9a63d2b398840261c8221a0c9b" ] // Sample device ID