I think you need to understand the difference between an output and an input. If the soundbar has an output, it is usually for daisy chaining to a second soundbar or auxiliary speaker. As almost no Disc players record anything, or accept other source material other than the physical disks, input from a soundbar is unneeded. Players extract sound directly from the disk itself to forward (output) to the TV. The TV in turn forwards the sound to the sound bar as an option to using the TV's internal speakers . There is no need for the soundbar to return that signal to the TV, which already receives all of its signals from the source player, usually a Blueray or DVD player.. Some bars might, might, have an on-screen menu that is intended for display on the TV, but not many, and not often. The sound bar is not a source, it is a speaker.
The soundbars manual should explain its intended function.