Admob No Fill from Ad Server - Failed to Load Ad: 3

No fill from server failed to load ad : 3

Check this link it's not your fault.

I have same problem and it's solution is increase you app user so send ad request to admob and show your ad.

It's rule is latest rule and admob privacy make strong so apply this rule

Before 2017 it's rule is not so ad show is work fine, but right now first to send some ad request than ad show

I hope solve your question.

When apps are newly registered with AdMob, it takes some time and a few ad requests to allow inventory to build. Because of this, you may not see live impressions immediately.

Admob Banner ads fail to load, Error Code : 3 No fill

I've tried combination of devices running with different OS. Finally I got solution.
I wrote this code when app was fail with error code 3 (No Fill Error)

<com.google.android.gms.ads.AdView
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        ads:adSize="SMART_BANNER"
        ads:adUnitId="XXXXXXXXXXXXXXXX>
    </com.google.android.gms.ads.AdView> 

Now As per google sample code I've to use width with match_parent so I've changed width with match_parent still same error occurred. So finally I've change Size type with BANNER and now it run in all devices. (Google's demo code use BANNER type) I just tried this size and now all devices run ads banner.
Not sure but as per my testing scenario ad was fail which device have large resolution (More than 16:9 ratio like 19:9 ratio 1080 x 2280 pixels) and After Set Banner size type as BANNER works fine with large resolution also.

"Failed to load ad: 3" with DoubleClick

W/Ads: Failed to load ad: 3

As per the Documentation you are getting the following error code:

public static final int ERROR_CODE_NO_FILL

The ad request was successful, but no ad was returned due to lack of
ad inventory.

Constant Value: 3

Based on the post onFailedToReceiveAd - Ad request successful, but no ad returned due to lack of ad inventory when using admob with adwhirl:

If you are getting this error, then your code is correct. The issue is
that AdMob does not always have an ad to return for every request.
This may happen particularly if you have just registered your AdMob
publisher ID, as it takes some time and multiple requests before the
new ID starts returning ads.

Another reason your fill rate may be low is that you don't have
AdSense backfill enabled, or you have filtered out some ads. Check
your app settings to see if that is the case.

EDIT:

Update app-ads.txt and use "setTestDeviceIds" to test on physical device.

As of time of editing these instructions:
https://developers.google.com/admob/android/test-ads
worked. To test ads I used Demo ad Unit and needed to add the app-ads.txt line and wait for it to be crawled by admob crawler (which alone worked on Android-12 emulator), but still gotten instruction in Logcat to use the "setTestDeviceIds" - code under above link, which turned out to be required to display test ads on physical device connected via USB.

Ads: Ad failed to load : 3

you may have to wait a few days. My ads are now appearing. I think we have to be patient.

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