Why do Eye tracking and hand tracking not work in an Unreal Engine project?

Eye tracking and hand tracking not working in an Unreal Engine project and showing "Unsupported" in Unreal Engine VRTemplate

More recent versions of Unreal Engine 5 (5.3+) support eye tracking via OpenXREyeTracker plugin and hand tracking via OpenXRHandTracking plugin. The recommended approach is upgrading to later UE versions:

https://developer.varjo.com/docs/unreal/ue5/eye-tracking-with-unreal5

You can switch between Ultraleap and Varjo hand-tracking from Varjo Base Settings