My web application integrates with Webex by creating a meeting with URL like m.php?AT=SM&TC=1&IP=1&PW=pJP22Z6R&DU=30&MN=Demo%20Meeting, and it was successfully until sometime last week. Now it responds with "serviceType=MC&AT=SM&ST=FAIL&RS=MeetingPasswordIsRequired". I have double checked and am pretty sure meeting password is provided, and I have also tried with different meeting passwords, but no luck.
The meeting site I am using is cisco. Please let me know if any further information is needed.
From your description and from the screenshot you provided, this definitely sounds like it's related to the security updates which now require any passwords to be sent via HTTP POST, not GET. There's an excellent blog post on the community pages explaining this, located at:
Cisco - Webex API Developer Services