Ads not shown for several weeks, error code 3

[Cuong Nguyen]

My first mobile app working good with test ads and even production ads with test device ( added Advertising ID). But then the ads just not shown up much any more, most of the time just received Error code 3, No fill. Even with my recently two apps, no ads showing. Then today, I received a policy violation  Limited ad serving started onJun 17, 2023. Not sure why, because, I'm not seeing any ads.

Admob Publisher ID: pub-2959176967880534

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for reaching out to us.

Since you’ve mentioned that you're encountering an “ad serving is limited” in your account, then this might be the reason why you're suddenly not seeing ads in your app. Kindly note that the ad serving limit might be a temporary ad serving limit to evaluate your traffic quality, or it might be because we've identified invalid traffic (https://support.google.com/admob/answer/3342054) concerns in your AdMob account. To avoid invalid traffic, we suggest using our test ad unit id (https://developers.google.com/admob/android/test-ads#demo_ad_units) and enable your test device  (https://developers.google.com/admob/android/test-ads#enable_test_devices) when testing your application. This ad serving limit typically impacts publishers for less than 30 days, it may take longer in some cases. You may check this article (https://support.google.com/admob/answer/9493252?hl=en) for more information or you may reach out to the Product Support Team (https://support.google.com/admob/thread/new?hl=en) to assist you better on this. 

This message is in relation to case "ref:_00D1U1174p._5004Q2mV1JZ:ref"

Thanks,
 

Mobile Ads SDK Team

[Cuong Nguyen]

But the  “ad serving is limited” is started on  Jun 17, 2023, but my app not shown ads for several weeks before that day. Not sure why, but before uploading my first app implemented admob, I tested that the ads shown up frequently (Production ads on test phone, labeled as Test ads), but several days later, It suddenly have very low match rate. I've already setup app-ads.txt, and follow all the guidance but still having low match rate. Very confusing to me.

[Mobile Ads SDK Forum Advisor]

Hello,

Kindly note that the SDK just requests an ad to the ad server (E.g: AdMob), and I'm afraid that it doesn't have any control on fill rate / match rate of your app. This is more of an ad serving issue/ fill rate concern which is out of scope to our team. That said, we would recommend raising this to our Product Support team (https://support.google.com/admob/thread/new?hl=en) instead as they are better equipped in handling these concerns.