You must be setup in Duo Two Factor Authenication before you will be able to connect if you are not already setup
Open the Zoom desktop icon and choose Login with SSO.
Type in ibml and click continue
You will then be taken to duoag.ibml.com. Type in your email and your Windows password (Office 365 password if you are at CAS or in the EU)
It will take you to the two-factor authentication method. Choose Send Me a Push or Call Me. With a push, a notification will be sent to your phone for you to approve. With Call me, you will receive a phone call (I think its Florida) to authenticate. Make sure to click Remember me for 30 days. It will go to the Zoom launch page where you will tell it to launch Zoom application