You try to add a subdomain to an existing domain in Microsoft Office 365 by using the New-MSOLDomain
cmdlet. However, you receive the following error message:
New-MsolDomain: Unable to add this domain. It is a subdomain and its authentication type is different from the authentication type of the root domain.
This issue occurs if you try to use the New-MSOLDomain
cmdlet to add a subdomain to an existing domain that's set up for federated authentication. The New-MSOLDomain
cmdlet tries to add the subdomain as a standard authentication domain.
To add a subdomain to a domain that's set up for federated authentication, follow these steps:
- Connect to Windows Azure Active Directory (Windows Azure AD) by using Windows PowerShell. For more info, go to the following Microsoft website:
- Use the New-MSOLFederatedDomain cmdlet.
The syntax to add a subdomain is as follows, where <subdomain> is the name of the subdomain that you want to add:
For more info about how to use Windows PowerShell to manage Windows Azure AD, go to the following Microsoft website:
Still need help? Go to the Office 365 Community
website or the Windows Azure Active Directory Forums