Plex DVR - can only record live TV

I recently setup an Ubuntu 16.04 server with a Plex Media server. Everything seems to work fine with the exception that I can NOT play live TV. I’m currently using an HD HOMERUN Connect device to stream my antenna signal to my Plex server. When I try to play a channel, there is only an option to record the show. Obviously, I don’t have something configured right because this setup works fine from my Windows machines with Plex servers. Any ideas?

There is a minimum server software version which supports live tv.
Check yours.
https://support.plex.tv/hc/en-us/articles/115007689648-Watching-Live-TV

Thank you for your answer. I’ve been to this page before but haven’t seen anything that might suggest where the problem lies. When I look at my program guide in Plex, I see no PLAY button on the screen - only a record button. After scouring the settings section, I did not see any option to enable/disable the ability to play live TV. A screenshot is attached.

Take a look at your plex server software version number.

I noticed that there was an update released on the 28th. I just finished applying it and all is well. Thanks for helping me!