Azure Active Directory Seamless Single Sign-On

What is Azure Active Directory Seamless Single Sign-On?

Azure Active Directory Seamless Single Sign-On (Azure AD Seamless SSO) automatically signs users in when they are on their corporate devices connected to your corporate network. When enabled, users don't need to type in their passwords to sign in to Azure AD, and usually, even type in their usernames. This feature provides your users easy access to your cloud-based applications without needing any additional on-premises components.

Seamless SSO can be combined with either the Password Hash Synchronization or Pass-through Authentication sign-in methods.

Seamless Single Sign-On


Seamless SSO is not applicable to Active Directory Federation Services (ADFS).

Key benefits

  • Great user experience
    • Users are automatically signed into both on-premises and cloud-based applications.
    • Users don't have to enter their passwords repeatedly.
  • Easy to deploy & administer
    • No additional components needed on-premises to make this work.
    • Works with any method of cloud authentication - Password Hash Synchronization or Pass-through Authentication.
    • Can be rolled out to some or all your users using Group Policy.
    • Register non-Windows 10 devices with Azure AD without the need for any AD FS infrastructure. This capability needs you to use version 2.1 or later of the workplace-join client.

Feature highlights

  • Sign-in username can be either the on-premises default username (userPrincipalName) or another attribute configured in Azure AD Connect (Alternate ID). Both use cases work because Seamless SSO uses the securityIdentifier claim in the Kerberos ticket to look up the corresponding user object in Azure AD.
  • Seamless SSO is an opportunistic feature. If it fails for any reason, the user sign-in experience goes back to its regular behavior - i.e, the user needs to enter their password on the sign-in page.
  • If an application forwards a domain_hint (OpenID Connect) or whr (SAML) parameter - identifying your tenant, or login_hint parameter - identifying the user, in its Azure AD sign-in request, users are automatically signed in without them entering usernames or passwords.
  • It can be enabled via Azure AD Connect.
  • It is a free feature, and you don't need any paid editions of Azure AD to use it.
  • It is supported on web browser-based clients and Office clients that support modern authentication on platforms and browsers capable of Kerberos authentication:
OS\Browser Internet Explorer Edge Google Chrome Mozilla Firefox Safari
Windows 10 Yes No Yes Yes* N/A
Windows 8.1 Yes N/A Yes Yes* N/A
Windows 8 Yes N/A Yes Yes* N/A
Windows 7 Yes N/A Yes Yes* N/A
Mac OS X N/A N/A Yes* Yes* Yes*

*Requires additional configuration


For Windows 10, the recommendation is to use Azure AD Join for the optimal single sign-on experience with Azure AD.

Next steps