I integrated InMobi SDK to my Andorid app, added one ad banner and one fullscreen ad.
I enabled test mode on InMobi site ad settings page for my ads and they were showing up ok (test ads).
But if I disable this option, then there are no any ads, listener in override fun onAdLoadFailed(p0: InMobiBanner, p1: InMobiAdRequestStatus) prints Ad request successful but no ad served. NO_FILL
It's already on Google Play, but still there are no any stats on their site about views, earnings, so nobody see any adds (app has ~70000 users)
The InMobi SDK relies on other dependencies from Google - like play-services-ads-identifier.
Be sure to integrate the deps from this guide: https://support.inmobi.com/monetize/android-guidelines (Section: Add & Verify Dependencies). It needs Google Play Services, Chrome Custom Tab (exchanged with Browser in AndroidX!), Picasso Library, Support Library, RecyclerView.