Assume that you try to configure a Microsoft Office 365 and Microsoft Exchange Server 2010 hybrid environment for Outlook Live users in a Microsoft Exchange Server 2010 environment. To do this, you use the Hybrid Configuration wizard. Additionally, the domain names of the Outlook Live users use the following format:
In this situation, you cannot configure the hybrid environment, and you receive the following error message:
The signup domain 'org' derived from 'TenantDomainName.org' is not a valid domain.
This issue occurs because the Hybrid Configuration wizard assumes that the domain names of the Outlook Live users use the following format:
To resolve this issue, install the following update rollup:
2746164 Description of Update Rollup 6 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Hybrid Configuration wizard, go to the following Microsoft website: