Hdmi cable sound wont come out even when the settings say that the sound is coming from tv

Macbook pro, new last August.
The weird part about this is that it worked about an hour before this happened and then I unplugged it and it stopped. The HDMI cable is plugged into the side of the laptop and the screen duplicator works fine but the sound doesn't come out. When I go to my settings, the sound is selected for the tv but nothing is coming out... the volume is up on the tv.

i have managed to fix this issue in a way that im not even sure how..

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