FWIW, i found that there’s a second option that needed to be changed under “online media sources” to turn on live tv for managed users. This is in addition to enabling it from within the “Plex Home” area where you enable it for each user. AND also, if you enable the “Live TV with DVR” you need to make sure that your server has write access to the media library. I think that is what was causing issues as i had it set to read only.
