Some folks have been getting an untrusted certificate error. A note popped up in the Zoom client under Chat -here are those instructions.

Viewing all of your Outlook meetings in the Zoom app

1. Sign in with your username and password at umsystem.zoom.us.
2. Click on Profile (See Fig. 1).
   

   Figure 1: Profile navigation in Zoom

3. Click Delete to remove your previous profile (See Fig. 2)
   
   

   Figure 2: Removing your old profile

4. Click Connect to Calendar and Contact Service (See Fig. 3).
   
   

   Figure 3: Connecting a new calendar

5. Click on Office 365, then click Next (See Fig. 4).
   
   

   Figure 4: Selecting which calendar to connect

6. Leave all automatically populated settings on this page as they are.
7. In the EWS URL text box enter https://outlook.office365.com/EWS/Exchange.asmx (See Fig. 5) .
8. Leave the bottom check box unchecked (See Fig. 5).
9. Click Authorize.
10. Sign in with your university credentials.
11. You should now see all of your Outlook meetings displayed under Meetings in the Zoom application.

Source: Viewing all of your Outlook meetings in the Zoom app