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Error when you try to use the New-MSOLDomain cmdlet to add a subdomain to an existing domain: "New-MsolDomain: Unable to add this domain"

PROBLEM
You try to add a subdomain to an existing domain in a Microsoft cloud service such as Office 365, Microsoft Intune, or Microsoft Azure 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.
CAUSE
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.
SOLUTION
To add a subdomain to a domain that's set up for federated authentication, follow these steps:
  1. Connect to Azure Active Directory (Azure AD) by using Windows PowerShell. For more info, go to the following Microsoft website:
  2. 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:
    New-MSOLFederatedDomain -DomainName:<subdomain>
MORE INFORMATION
For more info about how to use Windows PowerShell to manage Azure AD, go to the following Microsoft website:

Still need help? Go to the Office 365 Community website or the Azure Active Directory Forums website.
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Article ID: 2666578 - Last Review: 12/12/2014 09:47:00 - Revision: 17.0

Microsoft Azure cloud services, Microsoft Azure Active Directory, Microsoft Office 365, Microsoft Intune, CRM Online via Office 365 E Plans, Microsoft Azure Recovery Services, Office 365 User and Domain Management, Office 365 Identity Management

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