To run the sample first set the Allowed Callback URLs in the Application Settings so it works for both Android and iOS apps:

com.auth0.quickstart://__AUTH0_NAMESPACE__/android/com.auth0.quickstart/callback com.auth0.iossample://__AUTH0_NAMESPACE__/ios/com.auth0.iossample/callback

Set the Allowed Logout URLs in the Application Settings so it works for both Android and iOS apps:

com.auth0.quickstart://__AUTH0_NAMESPACE__/android/com.auth0.quickstart/callback com.auth0.iossample://__AUTH0_NAMESPACE__/ios/com.auth0.iossample/callback

Then, to run it on Windows:

Open the AndroidSample.sln or iOSSample.sln solution in Visual Studio 2017.
Click the Start button (the green play button), optionally selecting your target device. You can also start the application using the Debug | Start Debugging option from the main menu.

To run it on macOS:

Open the AndroidSample.sln or iOSSample.sln solution in Visual Studio for Mac.
Click the Start button (the play button), optionally selecting your target device. You can also start the application using the Run | Start Debugging option from the application menu

Select a native SDK