PROBLEM IS FIXED. Just started working again.
I am using the latest version of Chrome on OS Sierra. Just recently, my mic no longer works. I use an earbud mic, which works fine in Google Voice and Chrome allows access to the mic, but it does not work in Fire RTC. I have tried incognito mode, removing and re-adding the mic, restarting Chrome and using Safari instead. I switched earbuds about a week back, but the issue just started today. I do scam bait calls, but today, the scammers could not hear me and neither could I when I test called my cell phone. Any suggestions?