App Open Ads on admob - No ad config on test ads

Question

We are trying to add a new format to our app. We used a test ad ca-app-pub-3940256099942544/1033173712. And in the onAppOpenAdFailedToLoad callback we get this

{
      "Code": 3,
      "Message": "No ad config.",
      "Domain": "com.google.android.gms.ads",
      "Cause": "null",
      "Response Info": {
        "Response ID": "null",
        "Mediation Adapter Class Name": "",
        "Adapter Responses": []
      }
    }

debug build.

What could be the problem?

Thanx

Answer 1

According to their doc, AdMob has new requirements in order to receive test ads:

Option 1 (worked for us): Add this line to the app-ads.txt file for your app, and wait 24h for the AdMob crawler to update it:

google.com, pub-3940256099942544, DIRECT, f08c47fec0942fa0

Option 2: Enable test devices as explained here for iOS and Android

Answer 2

I have changed the application id in the app .gradle file. (change the example to a different one)

 defaultConfig {
    applicationId "com.____._____"
}

Before running the app, delete the Build folder and uninstall the previously installed app.