As of 11/9/20, at least for me, here is the status:
After successfully logging in using Chrome, Edge, Firefox, or Opera, they all give a “requesting microphone access” error.
If I reload the “requesting microphone access” page on Chrome, then I get a new popup window that asked me to login. But after I enter my username/password, and click the “Sign In” button, I get a 403 error.
If I reload the “requesting microphone access” page on Edge. Firefox, or Opera, then it works. WooHoo!!!
Previously I had tried reloading the “requesting microphone access” page using Chrome before, and gotten the 403 error before, but thanks to those who suggested that reloading the web page worked for them, I tried to do the same with the other web browsers. Thanks, to those who made that suggestion!!!