what browser you on because it works fine on chrome or do you have any kind of extensions?
brave browser has a known bug that causes almost anything to be auto mute. There is 2 ways to fix this:
1) Go to settings on brave, find the audio settings on brave and make sure it is at 100 or -100.
2) Brave auto blocks html/flash because the developers thought it was a good idea. you need to give the html/flash permission to use audio device in your computer.