Is there an API to check if an email address already exists in another Webex organization or if it has a free consumer account for Webex or Webex Meetings?

Hi, Since I deploy the Internet Reverse Proxy we are getting following error while joining WebEx meeting by VIP Public."We've hit a glitch in processing your request. Try again a little later."But its OK by CWMS private VIP. Thanks.Version: [cisco-we...