First set up Windows hello following these directions:
https://blogs.windows.com/devices/2015/12/17/how-to-set-up-windows-hello-on-your-surface-device/
Enable domain Users Sign-in using PIN: https://www.tenforums.com/tutorials/80520-enable-disable-domain-users-sign-pin-windows-10-a.html

How to reproduce:
1. Open "face id test.zip" project
2. Build to UWP using the Master build configuration
3. Open the build in Visual Studio and change the configuration to Master
4. Select Project > Store > Create App Packages
6. On the next window, choose "I want to create packages for sideloading".
7. On the next screen, have x64 checked with Master Solution Configuration and then create the App Package.
8. When Visual Studios finishes creating the package, browse to the Output location.
9. Copy the output files to the Surface Pro and run the face id test_1.0.0.0_x64_Master_Test\Add-AppDevPackage.ps1
10. Follow the prompts to install the app.

Expected result: The Windows Hello Window appears at the front of the Unity App
Actual result: The Windows Hello Window appears behind the Unity App

Reproducible in: 2018.4.16f1, 2019.2.20f1, 2019.3.0f5, 2020.1.0a21