The HDMI passthrough is working, why can't I get sound from my headphones?
Please check the following
1. ARC Soundbar Output Select switch is set to ON. The LED next to the ARC OUT port should be solid GREEN.
2. HDMI cables are oriented correctly. IN to TV, and OUT to soundbar.
3. TV settings are set up correctly. Grab your TV’s remote control, and go to SETTINGS > AUDIO > HDMI ARC > PCM