Unity TEST Banner Ads work in Editor but not on Device

I seemingly have TEST Unity Banner Ads working in my game “This would be your banner”, but they only work in the Editor. When I build for Android, TEST ads don’t show up. Are there placeholder Banner ads for Unity Ads? Or do I have to build for non-test mode to check? I don’t want to show real ads as I am still in the testing phase.

Sorry, I just realized I transposed a number in my game ID. This thread can be deleted.