Hi,
Thank you for reaching out to us.
Can you confirm if the webview you're using in your app are the following documentation guide for android (https://developers.google.com/admob/android/webview) and iOS (https://developers.google.com/admob/ios/webview)? You may also check this testing creative types in your debugging for iOS (https://developers.google.com/admob/ios/test-creative-types) and Android (https://developers.google.com/admob/android/test-creative-types).
Regards,
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Mobile Ads SDK Team |