After implementing native ads by following this codelab every thing worked, then I integrated it into my app, it shows the test ads perfectly, but when I want to deploy I head to https://apps.admob.com to create my ads unit and app id to replace the test one from Codelab.
From the admob page there is no option for native ad unit, I only saw.
- Banner
- Interstitial
- Video ads
I created banner ad unit hoping it will work, since I could not find native ad unit precisely. But after every trial no ads showed up.