Embedding unity library to android studio. Lots to learn about native android apps!

[Deleted User]

I'm stuck trying to add a unity library to an app in android studio.
I'm following this tutorial
https://medium.com/@davidbeloosesky/embedded-unity-within-android-app-7061f4f473a

But when I get to step 6 and I try to add the dependencies

I get either this:
Unable to find a matching configuration of project :nativeAndroidPluginTest-debug.aar: None of the consumable configurations have attributes.

or

Could not find method implementation() for arguments [project ':nativeAndroidPluginTest-debug.aar'] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.


Any ideas? I'd love the help.
Thanks