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To provision an Authorized Account for Exchange Online from Cloud App Security web console:

  1. Log on to the Cloud App Security management console.
  2. Go Dashboard > Service Status.
  3. Click Grant Access in the Action column for Exchange Online.

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  4. Select the policy to enable automatically when the access grant is complete.
  5. Click Grant Permission.

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  6. Specify your Office 365 Global Administrator credentials, and click Sign in.
  7. Click Accept to grant Cloud App Security permissions to use the Graph API to access all mailboxes.

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  8. Go back to the Cloud App Security management console as instructed.
  9. Wait until the process is completed.
    If the message "Successfully created a service account and synced data." appears on the screen, the grant is successful.
If for some reason the access token becomes invalid, you may refer to the "What to do next" section on Granting Access to Exchange Online with an Authorized Account.