No fill for banner ads?

I integrated banner ads into my recent app, and I kept getting errors saying that there was no fill. Now I could have been on not dev mode or something like that and doing something wrong on accident. But I also read that unity banner adds have low inventory. Is this true? Does unity have low inventory for banner ads? Does anyone have experience with this?

Hello,

Some time ago I contacted the Unity team for this very reason. They have low banner ad inventory for some regions.

They mainly have fill for Tier1 countries, but little inventory for Tier2 and Tier3.

Thank you. So, if I plan on releasing my game to the US only for now, I shouldn’t have any issues? At this point I’m on the fence… Unity ads are easy to implement, but if I won’t be getting any fills, I’ll go with AppLovin. AdMob decided to not approve my account (not app… account?) and gave literally no reason… I’m still in dev, so they didn’t even see the app.