To Install a new Microphone:
Make sure your microphone is connected to your PC.
Select Start > Settings > System > Sound.
In Sound settings, go to Input to see your connected microphones. If it's a Bluetooth microphone, select Add device.
To test a microphone that's already installed:
Make sure your microphone is connected to your PC.
Select Start > Settings > System > Sound.
In Input, select the microphone that you want to test.
In Input settings, look at Input volume while speaking into the microphone. If the bar moves while you speak, your microphone is working properly.
If don't see the bar moving, go to Test your microphone and select Start test.
The above is cited from https://support.microsoft.com/en-us/windows/how-to-set-up-and-test-microphones-in-windows-ba9a4aab-35d1-12ee-5835-cccac7ee87a4.
When using a One Eared Headset:
Agents who have 1 eared headsets, they will need to enable MONO Audio.
Windows lets you convert stereo sound into a single channel so you can hear everything, even if you're using just one headphone. Select the Start button, then select Settings > Accessibility > Audio, and then switch on the Mono audio toggle.
Is Chrome enabled to use microphone in their windows settings?
To use your microphone with apps on Windows, you'll need to turn on some permissions in Privacy & security settings. Here's how:
Select Start > Settings > Privacy & security. Then look for Microphone under App permissions and make sure Microphone access is turned on.
Then, allow apps access to your microphone. In Microphone settings, go to Let apps access your microphone and make sure it's turned On.
Once you've allowed microphone access to your apps, you can change the settings for each app. In Microphone settings, go to Choose which apps can access your microphone, and turn on apps you want to use with it. For desktop apps, make sure that Let desktop apps access your microphone is turned on.