Banner not showing in NON test mode. Video and rewarded video work correctly.

Hi, after publishing my app on the Android Store, i switched off the test mode on my ads.
Before that, banner and video worked correctly in test mode.

Now, with TEST MODE SWITCHED OFF, videos and rewarded videos work, but the banner is not showing.
I'm assuming that the code is correct, because if i switch to test mode all ads work perfectly.

Can be some country issue? I live in Italy.