Hi,
Check if your browser has the sound muted if it's a video site like YouTube.
To access YouTube in your browser, right-click at the top of the tab and see if there's an "unmute" option; press it to unmute the sound.
Check the video itself to make sure it's not muted.
Go to Start Menu > Settings > System > Sound > Volume Mix and see if your browser has the sound icon with an "x". If it does, click it again and see if it unmutes.
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Thanks