Please fill in the following fields:

Unity editor version: 2019.3.0f6
Play Services Resolver version: 1.2.135
Features in Play Services Resolver in use (Android Resolver, iOS Resolver, VersionHandler, etc.):
Android Resolver
Plugins SDK in use (Firebase, Admob, Facebook, etc.): Admob
Platform you are using the Unity editor on (Mac, Windows, or Linux): Windows 10
Platform you are targeting (iOS, Android, and/or desktop): Android
Scripting Runtime (Mono, and/or IL2CPP): IL2CPP

Please describe the issue here:

When I set my Target API Level to 29 (for Android 10 support), I get the following error message:

After setting the Target API to 29, pushing the "Resolve" or "Force Resolve" under the Android Resolver menu does nothing at all, whereas I'll get a "success" message on API Level 28. When changing the Target API to 28, there's no problem.

I'm using the NDK and SDK that come installed with Unity.

Please answer the following, if applicable:

Repro rate 100%, happens every time I switch the Target API to 29 (which is what I want for Android 10 support).