Hi,
If this is only happening with the browser, do the following: go to Start menu > Settings > System > Sound > Volume mixer > see if the browser you are using appears. Click the arrow and see if it's set to default or the correct sound device.
Check in your browser if any tabs are muted. In Chrome/Edge, when opening YouTube, select a video > right-click on the tab at the top of YouTube > Unmute tab.
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Thanks