I am using a usb tuner via a tvheadend server on a nuc libreelec box, using tvhproxy in docker.
(yes I know convaluted) My Plex server thinks its a Cable tuner. But if you go to the next page & put in your postcode? or zipcode mine picks up the channels.
Thanks for the hint bubblegum, but unfortunately the ‘continue’ button is disabled so I can’t continue to the next screen. Maybe an earlier version of PMS would allow me to do this?