I had the same problem with no sound from Chrome. Didn't appear in the volume mixer. Wasn't muted. The thing that worked for me was turning off hardware acceleration whatever that is.
Click on the 3 vertical dots in the top left of the screen.
From the menu click on Settings.
Click on Advanced.
Then click on System.
Turn off the toggle switch for "Use hardware acceleration where available"
Then relaunch.
Good luck!