When I run on the Hololens emulator, when the Vuforia Unity example loads the scene "2-HoloLens" the application stops with an error that Vuforia will not Initialize because the platform is not supported.
Note that the application starts on the emulator and properly displays the first two scenes with Vuforia green logo and then the loading spinner. It then displays a grey UI that indicates that Vuforia cant init because the platform is not supported.
I have a Vuforia key installed in Unity
Vuforia is checked in Unity build settings and appears in the VR SDKs list below Windows Mixed Reality
VS 2017 with Hololens emulator installed v10.0.14393.1358