Dear Glen Newell,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I'm really sorry to hear about the trouble you're experiencing with the microphones after the Windows 11 24H2 update. It sounds incredibly frustrating, especially since you've tried so many solutions already.
Recently, many users have reported similar audio problems with Windows 11 24H2. For now, the bug appears to be localized to "a limited set of devices" from unnamed manufacturers. Microsoft hasn't revealed which brand is affected. It seems that some audio drivers might not yet be perfectly adapted to this new update. We may need to be a bit patient while waiting for the latest drivers to be released.
In the meantime, here are a few additional steps you might try:
Go to Settings > Privacy & Security > Microphone > Ensure that Allow apps to access your microphone is turned on, and that Microsoft Teams has permission to use the microphone.
Open Device Manager > Expand Audio inputs and outputs > Right-click on your microphone device and select Update driver. Choose Search automatically for drivers. If the issue started after a driver update, you might try rolling back the driver by selecting Properties > Driver tab > Roll Back Driver.
Go to Control Panel > Sound > Recording tab > Right-click on your microphone and select Properties > Under the Advanced tab, uncheck Allow applications to take exclusive control of this device.
Run the Audio Troubleshooter: Go to Settings > System > Sound > Scroll down to Input and select Troubleshoot under your microphone device.
Compatibility Mode for Teams: Right-click the Microsoft Teams icon on your desktop > Select Properties > Compatibility tab > Check Run this program in compatibility mode for and select an earlier version of Windows.
If you’ve unknowingly installed the 24H2 update and your system suddenly loses sound, try rolling back your Windows version. Go to: Settings > Windows Update > Update History > Uninstall Updates. And revert to the previous one. This is especially effective if the bug disrupts your workflow.
If the issue persists, please let me know and we will investigate further. Rest assured, we are keeping a close eye on this issue and will update you as soon as we have more useful information.
Thank you for your understanding and patience. If there's anything else I can assist you with in the meantime, please let me know.
Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution. Thank you for your patience and cooperation.