Hi there,
Thank you for reaching out. Please try the following steps to play the audio on your Soundbar.
1) Set Sound Output to the TV Speaker by going to Settings > All Settings> Sound > Sound Output.
2) Check whether Digital Output Audio Format is set to Pass-Through by going to Settings > All Settings> Sound > Expert Settings > Digital Output Audio Format > Auto.
If you need more help, Samsung is here for you. Please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website.
~ Samsung Advisor