https://social.msdn.microsoft.com/Forums/sqlserver/en-US/51b14e7f-1d71-4dec-88fb-410d8be04e06/why-i-cant-authorize-guest-users?forum=WindowsAzureAD
https://blogs.perficient.com/2014/11/25/office-365-assign-licensing-user-location-via-active-directory/
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