Ads not showing if publishing

I had made an app on kodular and placed ads in it. I had also approved it from kodular and ads were showing successfully but as soon as I published it in playstore ads were not showing what to do and error was lack of ad inventory .

Still when I install apk directly it shows ads but not when I install from play store

Search the forum, this issue has been dealt with many times.

I saw full forum but not got this issue anywhere

Are you joking?

Search for “admob lack of inventory”. There are so many topics about it.