I replied similar thread, pleace check :
Hi :) ... just sharing :
Note : In my experience, Mobile Advert will not show in browser preview
and I still cannot understand how to use condition "On Configuration ..." according to the manual
So here is an example my way to make it work :
1. I use event button "on clicked" to make this example. of course it can be replace with other object event in your game design such as "on start of layout", "on touched object", etc...
2. I use test id in this example, if you gonna use the real ads in final project, you need to uncheck the "Test Mode" properties, fill the application ID, change the ad unit ID as well.. depends on your AdMob generated ad unit ID