The meeting URL which is generated by the Getjoinurlmeeting XML API works all good for directly joining a Webex Event seamlessly through the desktop client, but that is not the case with the mobile client of Webex.
The meeting does get joined through mobile but the attendee name specified in the XML Request is not used while joining the meeting/event from Webex mobile app.
It takes the name already defined in the Webex mobile app. Which is kind of illogical for asking the Attendee name during registration (i.e., XML API request), and then the attendee gets joined to the meeting not with the name specified in the XML API request but with the name defined in Webex mobile app.
It would be a huge help if the Webex mobile app also supports this API.