As of the commit https://github.com/EpicGames/UnrealEngine/commit/2907946ca120389157988a4378e8eedc8e8730fd HoloLens vanished from the build platforms. Will this be a temporary change/fix or is this permanent? Probably related to UE-181802.
Edit: i guess this may be the answer https://www.windowscentral.com/software-apps/windows-11/microsoft-is-killing-its-windows-vr-platform-announces-deprecation-of-windows-mixed-reality