Visual Studio Xamarin.UITest: "System.Exception : Android SDK not found." running UITests

I am attempting to get some UITests set up for my project, and am receiving an error when running them:

System.Exception : Android SDK not found. Please install it and if it is still not located, please set the ANDROID_HOME environment variable to point to the directory.

Searched locations: 
Windows Registry
(No path) - Not set. [ Source: ANDROID_HOME ]
   at Xamarin.UITest.Shared.Dependencies.AndroidSdkFinder.GetTools()
   at Xamarin.UITest.Shared.Android.DefaultAndroidFactory.BuildExecutor(IProcessRunner processRunner)
   at Xamarin.UITest.Android.AndroidApp..ctor(IAndroidAppConfiguration appConfiguration, IExecutor executor)
   at Xamarin.UITest.Configuration.AndroidAppConfigurator.StartApp(AppDataMode appDataMode)
   at project.UITest.AppInitializer.StartApp(Platform platform) in C:\Users\Jason\source\repos\project\project.UITest\AppInitializer.cs:line 16
   at StarTracker.UITest.Tests.BeforeEachTest() in C:\Users\Jason\source\repos\project\project.UITest\Tests.cs:line 25

When I run my project in Debug mode, the emulator loads without issues, so Visual Studio definitely knows where my Android SDK is. From another post for a different IDE, I added the "ANDROID_HOME" variable and pointed it to C:\Users\Jason\.android\ and C:\Program Files (x86)\Android\android-sdk\, but receive the same error.

This occurs if the emulator is already running, or if I'm depending on the UITest to start the emulator.

How do I fix this error?