I couldn't find a direct answer to this and a few people seem to have this problem.
I've integrated Google AdMob into my Flutterflow app. Using test ads and real ads works great in simulators for both Android and iOS.
However, when testing AdMob through TestFlight on iOS, the AdMob component just says, "Ad Loading..." and never loads any ads. Because of this, Apple would not approve my app for the App Store.
On Android, everything works great. Simulators, through Google Play testing, through official app publishing in the Play Store — works great.
My AdMob account has been approved, both apps verified, and there are no restrictions on my account. I've also added my payment info and checked everything on that side that would prevent ads from showing.
I'm not sure what to do, and it is difficult to debug a TestFlight app because it is not local development where I can see logs to debug.
Does anyone have any insight on what can be done to fix this problem?