Initially I was using smart banners and could display them. Somehow the size was rather unpredictable so I tried to fix a custom size for them. Below is what I am doing now.
AdSize adSize = new AdSize(Screen.width, Mathf.FloorToInt(Screen.height * 0.1f));
bannerView = new BannerView(adUnitId, adSize, AdPosition.Bottom);
In the Unity Editor, I received the following debugging messages:
Dummy .ctor
Dummy CreateBannerView
Dummy LoadAd
However when I tried it on my Android phone, the banner ad simply wasn't displayed.
What have I missed?
I don't want to use smart banners.
The official link is here.