Hi
Try Below
Check your TV's HDMI port audio settings. With the Fire Stick's HDMI port selected, open your TV's Action Menu or Settings and explore the Sound, Audio, and Speaker settings. Ensure that you've chosen the correct speakers and that the HDMI port's audio hasn't been muted or disabled. Try a different HDMI port
One of the most common reasons with your Firestick because it is not seated properly in the HDMI port on your Samsung TV. Push the Firestick firmly into the port until it is in tightly.