@Sanjeewa_Samanpriya1: Can you double check to make sure that the HDMI cable is connected to HDMI ARC port on both the soundbar and TV, then head to Home > Settings > Sound Output to see if you're able to select the soundbar from there. I'd also recommend reaching out to Panasonic, or referring to the home theatre system's user manual, as you may be required to establish a connection via the soundbar first of all.
