We have been struggling with this tonight as well. Everything was working fine a couple of hours ago, but we’re now recieving this error for all calls to the ZoomMtg.join.
Developer console seems to indicate a 403 error occuring in this call:
https://zoom.us/api/v1/wc/info?callback=localJsonpCallback&meetingNumber=… {rest of the URL redacted}
~Justin