Add a new Azure Stack Hub user account in Active Directory Federation Services (AD FS)
You can use the Active Directory Users and Computers snap-in to add additional users to an Azure Stack Hub environment, using AD FS as its identity provider.
Add Windows Server Active Directory users
Sign in to a computer with an account that provides access to the Windows Administrative Tools and open a new Microsoft Management Console (MMC).
Select File > Add or remove snap-in.
Replace directory-domain with the domain that matches your directory.
Select Active Directory Users and Computers > directory-domain > Users.
Select Action > New > User.
In New Object - User, provide user details. Select Next.
Provide and confirm a password.
Select Next to complete the values. Select Finish to create the user.