This is has been a problem for a good 2 years now but I never really thought of it because I dont scambait anymore, I tried today and got reminded of the problem and now im sad ;( I use firefox now as a temporary fix but it eats my memory.
Is your microphone configured correctly?
Vduc has a point here, if it is working on FireFox then it surely must be an issue with your microphone.
You can check this by going on the Test WebRTC website, from there you will be able to diagnose any issues that you have.