Builds made with Unity revisions later than 2019.4.24 (.25 and .26) crash on start up (showing the small Unity crash window).
Tested with Holoplay plugin 1.21 and 1.41
HoloPlay Service 1.20
All other usual solutions to get it to run failed, Power cycling display, computer and holoplay service, deleting build directory contents, library folder, visual studio projects, nothing solved it.
Reverting back to Unity 2019.4.24 instantly fixed the crashing.