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IIJ ID Service Manual [For Users]

Microsoft Outlook (iOS) When Using External CAs

This section describes the procedure to log in using device certificate authentication on Microsoft Outlook (iOS).

An iPhone 8 device loaded with iOS 11.4.1 is used in this example.

[ Reference ]

  • We recommend that you use one certificate per device. We do not support the use of one certificate shared by multiple devices.
  • The procedure may vary depending on the model of your device and the version of the OS.
    * Contact the device vendor for more information on the specific procedure for your device.

  1. Open App Store and then install Microsoft Authenticator. If it is already installed, proceed to the next step.
  2. Start Outlook, enter your ID, and then tap "Add Account."
  3. Tap "Open Authenticator."
  4. Enter your ID and then tap "Next."

  5. Enter your password and then tap "Next."

    [ Reference ]

    If you log in using a temporary password, you need to change your password.

  6. Enter your ID and then tap "Next."

    [ Reference ]

    As of August 2, 2018, Microsoft Authenticator for iOS cannot process certificate requests (CertificateRequset) properly. As a result, the user ID and password for device certificate authentication must be entered twice. Refer to "https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues/1086" for more information.

  7. Enter your password and then tap "Next."
  8. Tap "Continue."