You have a Microsoft Exchange organization that uses an SMTP address space of contoso.com. Several users use their contoso.com email address for self-service sign-up to Azure Active Directory (Azure AD). You gain global administrator privileges to the Azure AD tenant that contains the self-signed users. You need to prevent the users from creating user accounts in the contoso.com Azure AD tenant for self-service sign-up to Microsoft 365 services. Which PowerShell cmdlet should you run? 

Answer options:

A. Set-MsolCompanySettings
B. Set-MsolDomainFederationSettings
C. Update-MsolfederatedDomain
D. Set-MsolDomain

A

Reference: https://docs.microsoft.com/en-us/azure/active-directory/enterprise-users/directory-self-service-signup