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My name is Brandon. Thanks for joining the Zoom Community! Is your organization allowing Office 365 consent at the admin level? Please check your account settings to make sure that this is enabled at the account level.
You may need to reauthorize your EWS URL. https://support.zoom.us/hc/en-us/articles/360048674231-Managing-calendar-and-contacts-integration-fo....
Was this working as designed and then stopped working?
I do not believe that it was from the latest software release from Zoom because we are not seeing any other customers complaining of this issue. Zoom pulls its calendar and contacts information from the Exchange server on your Office 365 system. If there was a break in communication between that server and Zoom then a reauthorization is key to potentially solving this issue.