READ ME!!!
If you need help with a specific thing like selecting which speaker is being used, for example, you can scroll down the page until you find the instructions you are looking for. You do not need to read the entire article unless you like reading than by all means, read away.
...
Webcam: If you use a laptop with a webcam, but you use an external webcam, you might run into the issue where the laptop device doesn't know which one to use. Try unplugging the external Webcam and then restarting your laptop device before plugging the external Webcam back in try and see if your Teams detects the laptop's internal microphone.
Windows is not up to date: Sometimes, Windows updates can interfere with software. So in the bottom left of your laptop or workstation, click the Windows logo and then type "Check for Updates" and install any available updates. Once those updates have installed themselves, restart your computer so they can finish installing and check to see if that fixed your Team's microphone issues.
External Microphone: If you are using a USB stand-alone microphone or a USB headset with a microphone, sometimes changing the USB port in which the microphone was plugged into will fix the issue. If this does not work, then go to the manufacturer's website and try to download the latest drivers for that model of microphone or headset.
Surface Users with a Dock and external Webcam: If you are a Surface laptop user with a dock and an external webcam, but the Teams won't use your external Webcam, there is a fix for you (results may vary). If you unplug the Webcam from one USB port and plug it into another USB port, this can cause the driver for the Webcam to install itself, and then Team's could recognize the external Webcam now.
Users with Speaker issues: The sound settings in Windows works by prioritizing a specific audio device, like a pair of USB desk speakers, for example. This device is your system's default audio device and changes based on what you want to use. So in the bottom right of your main display, you should see a speaker icon, if you right-click that icon and select "Open Sound Settings," this will bring you to the sound settings. Find the "Sound Control Panel" option on the right-hand side and open it. If you don't see your sound device under the "Playback" tab, you should try to right-click and "show disabled devices" this way you can reenable the equipment that was disabled.
...