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IMSS  /  Services  /  Information Security  /  Duo MFA  /  Duo with Microsoft 365

How to use Duo with Microsoft 365

Microsoft 365 applications at Caltech require Duo multi-factor authentication. To sign in using Duo:

  1. Sign in to a Microsoft 365 application in using username@caltech.edu followed by your access.caltech password. You will see the familiar Microsoft-based login page with the Beckman Institute background image.
  2. After successfully entering your username@caltech.edu and your access.caltech password, you may be prompted by Duo. Use one of your configured second-factor authentication methods to complete the process.