Ads won't show if you haven't integrated the Google Mobile Ads SDK correctly. Is your ad implementation code working properly? Test your implementation code to check that ads can show. You can also use ad inspector to test your app's ad serving.
If you are seeing adverts whilst in test mode then you usually have implemented the adverts correctly in your app.
We have compiled a list of solutions that reviewers voted as the best overall alternatives and competitors to Google AdMob, including Facebook Audience Network, Unity Ads, Leadbolt, and MoPub.
When apps are newly registered with AdMob, it takes some time and a few ads requests to allow inventory to build. Because of this, you may not see live impressions immediately. Once your app starts making more requests, you should see more consistent results. Please note that test ads operate through the same channels as live ads. Being able to return a test ad ensures that your application is communicating properly with our network. Be patience it will work after some days.
Remove the line that says
.addTestDevice("4CCC00EF4EA205A6FE82E1AEB26B0839")
Also, when you use a virtual device, it shows the test ads no matter what. Are you testing it on a real device?
You might be using the sample unit id: ca-app-pub-3940256099942544/6300978111
If you use above then you will see test ads.
Make sure you change to your own unit id before releasing the app.
"It could be that you have only recently created a new Ad Unit ID and requesting for live ads. It could take a few hours for ads to start getting served if that is that case."
I faced the same problem, if you can show test ads, it's fine, live ads will be showed soon (of course after you removed .addTestDevice(...) ).
I guess that google need time to collect some information (location, age, gender...) to show properly ads that can interest user.
May be you know but NEVER forget: DO NOT touch the live ads, you will be banned soon.
https://groups.google.com/forum/#!category-topic/google-admob-ads-sdk/android/fBe3YL3ffpo
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