AdMob Free Integration

I integrated admob free into my ionic 5 app but I have some issue to show real banners.

I installed the plug and followed the instructions.

I configured the banner on admob (standard and interstitial).

If I configure test google banner. it works.

When I configure real banners, I always receive error 3, no fill.

It’s very strange. It is impossible that I don’t have banner availability for my zone (Italy)

I built android app and ios app. For both I have the same issue

Any help would be much appreciated