Hi,
i created Android game with UE4 version 4.21.2 and Blueprint only and I added admob banner inside the game, the banner worked well when I install the game from windows directly to my mobile but when I published my game to google play console the banner not work !!
Version 4.15 that I am using. My game does not work AdMob ad when I install the game of Windows directly to my mobile phone, but rather everything is configured right will it only work when I launch in the game store and link it to AdMob you? Cool your airplane game !!!