So, I setup a couple windows 10 computers now and I have a windows 10 phone and I was HOPING that the cortana bit would work nicely with plex but the UWP app is literally useless.
On the new computer I setup it doesn't even play music consistently for starters. (It will sometimes play when you hit play, other times it just does nothing or locks up totally until you close it and open it again.)
The cortana commands do nothing at all but say "I'm sorry, I can't play music on Plex" or "Sorry you need to add groove as a connected service....blah blah blah blah" because neither PMP nor UWP let you set them as a default player.
ALSO, you can't set auto sign in on UWP to a secondary user.
ALSO, the movies crash and skip on UWP.
ALSO, it doesn't show your secondary users as 'subscription users' in UWP so they probably can't do like 'plex mix' but it doesn't work well enough for me to try any of that (but that's probably the root of the reason why people are saying it is not activating correctly).
That's all. =)