Please try to factory-reset the emulator or reinstall it. What's the version of Visual Studio on your pc? I am testing the function on 16.95 version. If above doesn't work, please update your VS to the lastest stable version for testing.
And you can install Android Studio, make Android studio and visual studio to use same Android SDK path, Then create a emulator by Android Studio, start the emulator. if it works
visual studio android sdk path
Android Studio android sdk path