Usually we’ve seen this issue only with Asset Store version, but would be fixed when upgrading to most recent version. Let me know if it’s actually engine integrated version.
It can be that I first installed it from Asset Store, and then reverted back to (presumably) clean state with Git Desktop, and then activated/installed it from the Services-tab.
All the folders under /plugins (Android and iOS) are empty. Working as intended or should I remove the plugins-folder?
Can you check you don’t have files in “Standard Assets/Editor/UnityAds” folder as well. You can see which files was in asset store package at Unity Asset Store - The Best Assets for Game Making (scroll down to “Package Contents” part)
The folders and *.meta-files exists. Otherwise the folders are empty. Trying to re-import package from store shows only the files to be added (all of them) as new. Including the both .h files (UnityAds.h and UnityAdsUnityWrapper.h).
Looks like your iOS builds aren’t properly pulling in the Ads SDK when building the XCode project. Reports of this in the past have usually been fixed by reinstalling the SDK.
You should be able to do this either by disabling and re-enabling ads in the services window or by removing any ads files and reinstalling (preferably from the package manager, but the asset store version should work as well)
I am having this same issue. I have updated Ads and In App Purchasing to the latest version, tried removing and re-importing those packages. These steps have not solved the problem. I am using xcode 10, unity 2019.3.7f1, and a mac with high sierra.