Windows 10 not outputting sound when connecting HDMI to TV

I am used to using my windows 10 laptop to connect to my TV and watch stuff. I do this all the time, however recently the sound has stopped working. To be clear the video works but the sound does not. I have tried another HDMI cable and this does not solve the problem which suggests that its something to the with the settings in windows 10 causing the issue. Does anybody have any idea what the issue might be?

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