Virtual Background does not work reliably
MacBook Pro Retina mid-2012 with macOS 10.14.6
When quitting and restarting Teams the virtual background feature disappears and is no more available during your video meetings. To make it work again I found a tedious workaround:
Go to settings -> Camera settings, launch a test call -> The video sometimes does not show virtual background so hangup. Launch again a test call, after few seconds the virtual background may appears and now you can hangup and use team for any meeting with virtual background activated... until the next restart of Teams.
This 100% reproducible on my setup.