UPN must be used to log on to OWA, Outlook, and EAS in Office 365 Dedicated/ITAR (vNext)
Therefore, the PrimarySMTPAddress value should match the UPN value.
- Use the UPN for all authentication.
- Change the UPN to match the PrimarySMTPAddress by using Method 1 in 2669550: Changes aren't synced by the Azure Active Directory Sync tool after you change the UPN of a user account to use a different federated domain.
- Configure an alternate logon ID.
Article ID: 3158782 - Last Review: 04/25/2016 16:53:00 - Revision: 1.0
- vkbportal226 KB3158782