HDMI PC to TV audio not working

I'm trying to use my TV as a third monitor and it works fine with the HDMI cable I'm using, put went I try to get the audio to go through the TV speakers it doesn't work.The Tv only appears as a monitor in my devices and doesn't come up as an audio playback device.

I've ticked 'Show Disabled/Disconnected Devices' and still nothing.

Any help would be much appreciated. Thanks.
 

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Did you select HDMI as Default for you audio? I am assuming that you have a dedicated graphics card because you have 3 monitor setup. What is the graphics card?
 
Could you please either provide the make and model of the computer or list the parts to the computer. Trying to figure out your setup. Normally in order to get a triple monitor setup you have a dedicated graphics card, but some motherboards might have that built in as an option. Cant help unless I know what your working with.
 
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