I'm implementing AdMob's Reward Video Ad into my app. While using dedicated test ad unit ID for Android rewarded video the test Reward Video Ad is showing perfectly. But when I am using my own app ID along with created add unit ID I'm getting `Failed to load ad: 3` quite often. Am I right that such error means that no ad was returned due to lack of ad inventory?
Another question is regarding ad capping. It was set to 3 ads per hour for a user, but I managed to watch more than 3 ads (my own add unit ID, not the test one) in about 10 minutes. What can go wrong with the capping? If the user has overcome the limit, how AdMob informs the client about it, as far as I know there is no dedicated error code for it?