Are Facebook Ads working?
Yes, they are working 
But they are not working in my app!
Use this block in order to debug the problem:
The error variable will return you the problem in the ads
Common error responses:
-
No fill: This is returned by the error when there are no available ads to show for the user
This does NOT mean a missconfiguration or an error in the component; this means that Facebook doesn’t have any ad to show to THE USER. This happens because Facebook Ads work as a auction bid. So, if Facebook can’t show ads if they doesn’t find a suitable ad for user, because else ad publishers will be paying them for an ad service that they doesn’t want as it publishers won’t get any result
There’s no “real” solution for this. You can just add alternative ad networks in case this happens and attempt to show the ad using other ad network (such us AdMob )