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You can't sign in to Lync Online by using a domain that is configured for full redelegation
Article ID: 2526143 - View products that this article applies to.
Not sure what release of Office 365 you're using? Go to the following Microsoft website:
Am I using Office 365 after the service upgrade?
When you try to sign in to Microsoft Lync Online in Office 365 as a Microsoft Office 365 small business and professional customer who has a custom verified domain, you receive an error message that indicates that the server is temporarily unavailable.
Note Office 365 small business and professional customers who have custom verified domains have those domains fully redelegated to Office 365. "Full domain redelegation" indicates a domain for which the name server (NS) resource records point to Office 365. Therefore, the Domain Name System (DNS) records that are required for Office 365 functionality are managed by Office 365.
To fix this problem, follow these steps:
(http://support.microsoft.com/kb/2541980/ )How to troubleshoot sign-in issues in Lync Online
Still need help? Go to the Office 365 Community