This Link has all that you will need for Webex/Zoom calling. It actually gives you independent Join Webex and Join Zoom Call Buttons (along with other meeting controls and functions). Good Luck.... https://community.cisco.com/t5/telepresence-and-vide...

Take another look at you UID setting is correct.AttributeRequiredUsageuidYesWebex username, usually set to corporate usernamefirstnameYes lastnameYes DisplaynameNoUsed to show the user’s name in the meeting participant list.emailYes groupidNoSupports...