Microphone input not recognised

[Microsoft Windows]

My Asus Vivobook 17 no longer recognises the mic input from the built in microphone. I'm running Windows 11 with Office 365. There is no response in microphone test function in sound settingsand it doesn't respond in Word in dictate mode or Zoom or MS Teams meetings There is a mic icon on the taskbar which is greyed out when I'm attempting to use the microphoneAll was OK until a few months ago when for no apparent reason it stopped working

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