Hi Brett! To set up HDMI ARC, power on your TV and soundbar.
1. Next, connect one end of an HDMI cable into the HDMI IN (ARC) port on your TV.
2. Connect the other end into the HDMI OUT (TV-ARC) port on your soundbar.
3. Next, change the source on your soundbar to the D.IN. setting.
4. After a few seconds, "TV ARC" will appear on the soundbar's display, and the TV will transfer audio through the soundbar.
If you continue to experience issues with the connection of your new Samsung soundbar, please reach out to Samsung Support at: 1-800-SAMSUNG, available 8AM - 12AM EST, 7 days a week, or Chat with us on Samsung.com: https://www.samsung.com/us/support/contact/
^Tim