I am having trouble getting my Samsung and bose to communicate through the HDMI ARC channel.
Everything worked flawlessly for a long while until I wanted to test an optical cable and see if the sound is any better. (it wasn't to my untrained ears) so I want my convenience back to control my sound system and TV with one Samsung remote.
It sounds like the optical assignment is still set for the TV input. If you navigate through the system menu and remove the assignment, you should start getting connectivity with the TV again. If not, I would recommend following these steps HERE for some further ARC troubleshooting. When they mention disabled CEC, this would not be done through the app, but should be through the system menu on the console.