Office 365 User Names Error

Office 365 user names should always be specified as email addresses​: This error indicates that the specified Office 365 user name is invalid. Office 365 requires users to log in with an email address, not a user name as in "John Doe" or "domain\johndoe".​

Resolution:

We recommend the following:

  1. If using administrative credentials for Office 365, check the admin user name specified on your project.
  2. If not using administrative credentials for Office 365, check the mailbox owner user name specified on the mailbox.
  3. In all cases, make sure the user name work when logging in at https://login.microsoftonline.com.
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