Plex DVR, Trying to watch Live TV but get error "Unable to tune channel (no parts)"

If there is a problem and specifically when using the Plex for Apple TV app, please attach server logs and Plex for Apple TV log

For server logs
See
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
https://support.plex.tv/articles/200250417-plex-media-server-log-files/

and for Apple TV logs obtained through browser and saved to text file
See
https://support.plex.tv/articles/212639598-apple-tv-logs/