The following method works in order to get Plex running on an Xbox One again.
- Ensure that Plex Server is running.
- Turn on Xbox and Sign-In
- Launch Plex and wait for the error message stating that the server cannot be found
- Press the Options Button on you Xbox Remote (The three lines to the right of the home button)
- Go to Settings
- Got to Security and change the setting to “Allow - On same network as Server”
- Go back and you will get the error message again.
- Select “Go Home”
- It should load, if it does not, go back to the settings and select allow then hit “Go Home” and it should work. You can then set it back to “Allow - On same network as server”
Hope this works for everyone as it did for me. I did nothing else.
Thanks