Article ID: 2565604 - View products that this article applies to.
When you use Outlook Web App in Office 365, you may experience the following issues:
To resolve this issue, make sure that the DNS records for your domain’s DNS host are configured correctly. Specifically, the DNS SRV record for federation and the LyncDiscover DNS CNAME record are required for IM and online meeting functionality to work in Outlook Web App. For more information, see the following Microsoft Knowledge Base article:
2566790If the DNS record is created correctly but you continue to receive the error message, contact Office 365 technical support for additional assistance. Before you contact support, try to run the Get-Mailbox cmdlet and have the results available for the support tech. To do this, follow these steps:
(https://support.microsoft.com/kb/2566790/ )Troubleshooting Skype for Business Online DNS configuration issues in Office 365
This issue occurs if certain DNS records are missing or misconfigured with the DNS host of the custom domain.
Each DNS host is different, and each host may have different ways of adding DNS records. To identify your DNS host and to learn how to add specific DNS records, see the following Office 365 help topic:
Locate your domain registrar or DNS service providerIf you're trying to integrate the Exchange Online Outlook Web App with an on-premises Lync Server 2013 deployment or the other way around, go to the following Microsoft Knowledge Base articles:
Still need help? Go to the Office 365 Community
Article ID: 2565604 - Last Review: April 30, 2015 - Revision: 22.0