Server Version#: 1.20.4.3508
Player Version#: 3.2.2
I don’t receive desktop notifications when a track is played in Plexamp. I’m running Manjaro Linux with LXDE as my desktop environment. “Send notifications” is enabled under Settings > Appearance. I’m not sure if “Push Notifications” needs to be enabled in my Plex server settings, but it is enabled (afaik, that is for notifications of new content, like a new episode of a show, in your library).
Do desktop notifications work for anyone else running Plexamp in Linux?