I had a hard time with this issue as I still use the older iPhone plug in headphones.
Because I was plugging in my iPhone headphones into the top of my computer, the Windows 10 software wasn't allowing me to choose the iPhone mic instead of the AverMedia webcam mic.
The computer was playing both, so I could hear myself delayed in the earphones. After a few minutes the computer just chose to have no mic.
I have since got an extension cord and was able to plug in my iPhone headphones into the back of the computer into the "Line In" port.
I found this solution no where on the internet, had to figure it out myself after trying all the above Windows Sound Setting options.
I hope this solution may help other users in the future.