Error to display real banner {"isTrusted":false,"error":3,"reason":"No fill","adType":"rewardvideo"}

[lsantaniello]

I integrated admob into my ionic app and built for android.

I add into AndroidManifest.xml the appID

​<meta-data android:name="com.google.android.gms.ads.APPLICATION_ID" android:value="ca-app-pub-xxxxxxx~xxxxxxxx" />

if I use test units, everything works fine.

When i configure my banenr ids, the banner is not displayed and i get this error message

​{"isTrusted":false,"error":3,"reason":"No fill","adType":"rewardvideo"}

The same issue is for Standard banner or Interstitial

In the community I read that the reason is "no ad was returned due to lack of ad inventory." but it'is very strange. I'm in Italy region

Could you please help me to understand and how solve my issue?

Thanks