This is strange, my VR headset is always connected to the computer, and when I activate the VR mode in MSFS (with CTRL+TAB, default assignment if I'm not mistaken), it automatically triggers the Windows Mixed Reality Portal application, which switches the headset ON, and I get the picture in the headset after a few seconds.
I also had to install OpenXR runtimes, and I also installed the OpenXR Development Tools from Microsoft, which has this purple icon with transparent background in my start menu,
That application has three tabstrips, the last one is "Mixed Reality" and it tells me if the OpenXR runtime is active or not. If not, it offers me a button to "define OpenXR runtime as active runtime" or something like that. Just a click and its done.
Just in case, did you check in your MS Store application if all your applications were up to date ? (Library-> "get updates" button)
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