The way to solve it is to update `RequestConfiguration` with the **testDeviceIds**
String version; List<String> testDeviceIds = ['289C....E6']; void main() async { WidgetsFlutterBinding.ensureInitialized(); timeDilation = 1; PackageInfo packageInfo = await PackageInfo.fromPlatform(); version = packageInfo.version; MobileAds.instance.initialize(); // thing to add RequestConfiguration configuration = RequestConfiguration(testDeviceIds: testDeviceIds); MobileAds.instance.updateRequestConfiguration(configuration); await Firebase.initializeApp(); runApp(MyApp()); }
**How to get TestDeviceIDs**
If you want to test ads in your app as you're developing.
1. Load your ads-integrated app and make an ad request. 2. Check the logcat output for a message that looks like the one below, which shows you your device ID and how to add it as a test device:

`Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("289.......E6") to get test ads on this device.`
3. Add the device ID that your logcat gave you in the terminal, and use it as testDeviceId

## Solution ## The way to solve it is to update `RequestConfiguration` with the **testDeviceIds**
String version; List<String> testDeviceIds = ['289C....E6'];
void main() async { WidgetsFlutterBinding.ensureInitialized(); timeDilation = 1; PackageInfo packageInfo = await PackageInfo.fromPlatform(); version = packageInfo.version; MobileAds.instance.initialize();
// thing to add RequestConfiguration configuration = RequestConfiguration(testDeviceIds: testDeviceIds); MobileAds.instance.updateRequestConfiguration(configuration);

await Firebase.initializeApp(); runApp(MyApp()); } ## How to get TestDeviceIDs ## If you want to test ads in your app as you're developing.
- Load your ads-integrated app and make an ad request. - Check the logcat output for a message that looks like the one below, which shows you your device ID and how to add it as a test device: `Use RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("289.......E6") to get test ads on this device.` - Add the device ID that your logcat gave you in the terminal, and use it as testDeviceId