I have 3 Android apps, only 2 currently in store. Each of them is on a seperate mediation group but all have exactly the same settings and the same ad unit types.
Basically, They're all the same and should work the same but one of them DO NOT.
One of the apps keeps failing on loading the ad with errorcode 3, I noticed that If I keep the app running then after a while it manages to load successfully. I'm not doing anything differently code-wise, all apps work the same way, so what can possibly cause this?
I know what the error means by the way, I checked online before and I have no clue why this one is different.
Check this link it's not your fault.
I have same problem and it's solution is increase you app user so send ad request to admob and show your ad.
It's rule is latest rule and admob privacy make strong so apply this rule
Before 2017 it's rule is not so ad show is work fine, but right now first to send some ad request than ad show
I hope solve your question.
When apps are newly registered with AdMob, it takes some time and a few ad requests to allow inventory to build. Because of this, you may not see live impressions immediately.