I put fixed because I did have the "Internet" option "off" in the Android export module... But validating it to "on" did not fix my issue.
I Setup adMob account and create a new baneer for my app.
Then I used the code provided by admob for this ad.
And the ad don't display on my app.
Here is my setup for the admob ab :
SetAdMobDetails( "ca-app-pub-.................../..............." ) // <- With the good code instead of these dots
CreateAdvert( 0, 1, 0, 0 )
SetAdvertVisible( 1 )
RequestAdvertRefresh()
I activated the ad in the google play developer console app parameters.