Apparently its not yet in NVDA core, because every OEM announces those hotkeys differently.
Feature request: mute microphone command · Issue #16056 · nvaccess/nvda
Is your feature request related to a problem? Please describe. I would like to be able to mute microphone easily during online calls in Skype, Teams, Zoom and browser-based VC apps. Describe the solution you'd like NVDA keystroke that mu...
GitHub (github.com)