I developed my first app using the XamrinForms, I'm new to Admob, I used Test banner Ad and it worked well, but when using the real banner on a real device the ad doesn't appear, I searched about this problem and i found some devlopers say that "The ad on the real device It may doesn't appear because it may take some time and many requests for AD to build AD resources". As for the time, I have waited for more than three days. As for the number of requests, I didn't understand them well. For example, how many requests does the ad require to appear? Does this mean that ads will not appear until after uploading the app to Google Play and downloading it by many users?
By the way, the real ad appears on the emulator as a test ad, but on the real device it doesn't appear at all
Sorry about my bad english