Cannot setup new project in Unity 6 for vision OS

Unity Engine
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1

Following these instructions:

https://docs.unity3d.com/Packages/com.unity.polyspatial.visionos@2.0/manual/Install.html#install-the-xr-packages

Apple visionOS cannot be enabled in the XR Plug-in Management settings.

The checkbox is clicked, it is checked for a moment, then it unchecks itself with no errors thrown.