This article discusses various issues with removing software from a MAC. Some methods may do a more thorough job than just using the standard delete options (move to trash or using the delete app function).
If you have a progress icon, for example the color wheel, that keeps spinning and does not establish a connection then check the keychain.
In this example, the password in the Mac keychain was causing the app from responding. Go into the Keychain Access, type in Webex and uwmadison and delete the two entries.
Have user install AppCleaner from here - https://freemacsoft.net/appcleaner/
Steps to take to remove Webex Meetings: