Solutions for Skype for Business Online users
Solutions for Office 365 administratorsTo resolve this issue, make sure that the Exchange account in Outlook matches the account that's used to sign in to Skype for Business Online. If the Exchange mailbox and the Lync account are both hosted by Microsoft Office 365, make sure that the user’s Exchange primary SMTP address matches the user principal name (UPN).
You can use the Set-MsolUserPrincipalName cmdlet from Microsoft Azure Active Directory Module for Windows PowerShell to set the UPN, SMTP, and Session Initiation Protocol (SIP) addresses to the same value. For more information, go to the following Microsoft websites:
This error may also occur when Lync is expecting to integrate with a mailbox that's different from the mailbox that's configured in Outlook. For example, if Lync expects the user’s email address to be firstname.lastname@example.org, but Outlook is connected to the mailbox for email@example.com, you may experience this error.
Lync uses the WindowsEmailAddress or MAIL attribute to determine which Exchange server Outlook should connect to. If Lync makes that connection through Exchange Autodiscover and Exchange Web Services (EWS), and if Outlook is configured for another user’s mailbox, Lync registers that as a problem and returns this error.
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