Windows Mixed Reality devices can typically be run through OpenVR or SteamVR. I recommend targeting OpenVR if possible as that will allow you to support multiple platforms (such as Oculus, HTC Vive, etc) with a single build.
OpenVR is included in the package list by default with VRIF. If you need to manually setup OpenVR, make sure you are using Unity 2019.4LTS and have the "OpenVR Desktop Package" installed in the package manager :
And double check it is listed in your SDK list, under Player Settings :