Had to roll back to previous plex server version for windows 7, as managed users with no live tv restrictions were not able to get access to live tv after the latest plex server update, although administrator access was able to get to the live tv scheduler and recorded programs with no problems.
I am having the same issue. My account works fine but my mother can no longer stream her live TV when she visits. All devices affected. Android phone, tablet, rokus, etc, etc.