This feature does not use your Zoom SSO credentials, but rather associates your Zoom account with your Microsoft account and facilitates quicker authentication.
For greater ease of use and quicker sign-in, the Outlook add-in can link the user’s Microsoft credentials to the user’s Zoom credentials, facilitating the Outlook add-in sign-in process and making it appear automatic.
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Once the Zoom add-in for Outlook is deployed, users should automatically be signed in to their Zoom account using the existing SSO credentials.
Now when that user opens the Zoom add-in for Outlook, they will be automatically signed-in with their Zoom account.