Client not able to hear me

Sorry, long winded, but I wanted to be detailed.
I am having issues where I can hear and see the client, but they can see me and not hear me.
Background:
When I log into Doxy, I get an orange banner saying ’ Hmm, we don’t hear anything from your microphone. Click here for suggestions to get it working.
All the suggestions in the troubleshooting page do not work as I have allowed both camera and microphone but only the camera is detected.
I have even purchased an external webcam with a microphone, and still the microphone is not detected.
The pretest call also fails to detect sound when testing the microphone.
This issue occurs with both chrome and firefox.
I have restarted and refreshed and no resolution. Help>