Ads not showing in app but working alright in Unity

I sent the app on my google drive to test that everything is working fine as i am preparing for release. But Ads are not showing up at all. Neither the screen from test mode nor the ad itself. In unity it says all is working fine. The ID is the correct one, no errors at all. (This is for the Interstatial one) And wierdly enough, the rewarded one works completely fine. I am really confused, can anybody help?

I think it is to avoid people making money with unpublished games. So it first works, when the game is in the Appstore/Playstore