Also, when I use the Oculus blueprint node for Get Device Name (which should simply return Quest, not a UID) - the call fails and returns an empty string.
No - not exactly. I did find a way to get the "androidID" which for the quest is at least a unique HW identifier, but now with the enterprise portal coming on soon I really do need the actual Serial number which is NOT the Android ID I get.
I think I need a little support from Oculus here. (I will email our contact directly and link to this thread)