Multi Output Audio greyed out

[SirOlwyn]

I have a Samsung un50tu8000fxza tv and a samsung HW-B63C/ZA sound bar. The soundbar is paired via Bluetooth. The Multi Output audio is greyed out so i can not make sound come out of the TV and Soundbar at the same time.

I have tried unpairing the soundbar and pairing it back, adjusting every sound setting I can find etc. None of them work.

There is nothing other than the cable box plugged into the TV via an HDMI.

[beagle2mars]

The soundbar supersede's the tv sound so you don't need tv sound!

[SirOlwyn]

Which would be fine if the sound bar was under the TV. But the sound bar is next to my 96yo Grandma's chair so she can hear better and I wanted the TV on also for everyone else in the room.