SSO failed cannot use add-in on Outlook

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When adding an appointment and select zoom to add , it will require to sign to SSO

When clicking SSO the error is shown in the attached.

OS is MAC big Sur

TS done:

- Reinstalled Zoom add-in

- Reboot laptop

- OWA also shows the same error

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Effective January 9th, 2026 through January 22nd, 2026: The Zoom Community is currently in read-only mode with login disabled, to deliver you a new and improved community experience!