Apple TV and Plex app

New to Plex Pass. Am using HDHomeRun duo with latest firmware and on my Mac using Plex App can see my program guide and watch live OTA TV. On my Apple TV 4 with the Plex app I don’t see the program guide and therefore cannot watch Live OTA TV on my Apple TV. What am I doing wrong or what settings need tweaking? Have searched your site and can’t find the answer. If possible could you provide clear step by step instruction. My router is the latest firmware on a Apple Airport on 5 GHZ Network. Thx