You'll have to explore other solutions (setups) where the optical goes to some optical to analog and then to an audion Bluetooth sender.
Remember I see what you have and it's not working so a change would be next.
I have a Vidao 40" 4K ultra HD TV (model V4040HD). I want to use bluetooth headphones.
There is no headphone jack on my TV, so I plugged my bluetooth transmitter to "Audio out" on my TV. My bluetooth headphones are working, I can hear the sound. The problem is that there is also sound from my TV speakers, and I don't want that.
In TV settings, the only relevant setting I see is "digital audio output", but even if I select Off, there is still sound on TV speakers.
How can I prevent sound from being played on my TV speakers while using my bluetooth headphones?

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