As a test I uploaded a blank project with only ads and a button.
Things I have made sure
*XDK project has the plugin, admob pro with the cordova extension
*Used the ad ID from admob website in Construct 2 admob object
*Linked the admob ad to the app in play store
*Test mode = no, in Construct 2 admob object
*device connected to the internet
My Project
1 on start of layout, preload banner ad
2 on banner ad loaded, enable button
3 on button clicked, show banner ad
Two never works :3
Pre thanks