How to Deploy Windows Hello for Business in a Hybrid Cloud Trust Topology

Windows Hello for Business (WHfB) completely replaces traditional, easily compromised passwords with strong, hardware-backed, two-factor authentication (biometrics or a PIN tied to the specific device’s TPM chip). For organizations operating in a hybrid state (utilizing both on-premises Active Directory and Microsoft Entra ID), deploying WHfB has historically been a complex engineering challenge requiring Active Directory Federation Services (ADFS) or public Key Trust infrastructure. However, Microsoft recently introduced the Cloud Trust topology, which fundamentally simplifies WHfB deployment by completely eliminating the need for Public Key Infrastructure (PKI) certificate issuance or ADFS integration.

Understanding the Cloud Trust Topology

In traditional WHfB hybrid deployments (Key Trust or Certificate Trust), the underlying Windows Server Active Directory domain controllers required complex configuration to issue and validate certificates or rely on Azure AD Connect to synchronize public keys. If synchronization was delayed, users could not authenticate.

The Cloud Trust topology bypasses these requirements entirely. It relies on a seamless cryptographic exchange where Microsoft Entra ID (formerly Azure AD) issues a specialized, short-lived Kerberos Ticket-Granting Ticket (TGT) to the Windows 10/11 client upon successful biometric authentication. Because the on-premises Active Directory Domain Controllers are configured to mathematically trust Entra ID as a legitimate Key Distribution Center (KDC), the client can immediately utilize this cloud-issued TGT to request service tickets for on-premises file shares, legacy applications, and printers without ever needing a local certificate.

Prerequisites for Cloud Trust Deployment

Before initiating the Cloud Trust configuration, ensure your environment meets the strict baseline requirements:

• All domain controllers must be running Windows Server 2016 or newer, fully patched with the latest Cumulative Updates.
• Client devices must be running Windows 10 version 21H2 or Windows 11.
• Devices must be Hybrid Azure AD Joined (registered in both local AD and Entra ID).
• You must have Microsoft Entra Connect (Azure AD Connect) actively synchronizing identities.

Configuring the Azure AD Kerberos Object

The core configuration involves creating an Azure AD Kerberos Server object within your on-premises Active Directory. This object is what mathematically binds the cloud KDC to your local domain.

Log in to an on-premises Domain Controller with Domain Admin credentials. Ensure the Azure AD PowerShell module is installed. You must execute a specific script provided by Microsoft to initialize the trust.

Install-Module -Name AzureAD
Import-Module AzureAD

# Authenticate to Entra ID as a Global Administrator
Connect-AzureAD

# Download and execute the official Kerberos setup script
# (Ensure you are executing this from a trusted, secure administrative workstation)
Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope Process
.\Set-AzureADKerberosServer.ps1 -Domain "corp.digitash.com" -UserPrincipalName "[email protected]"

This script provisions a read-only computer object in your local Active Directory (AzureADKerberos) and securely synchronizes its cryptographic keys with Entra ID. This allows Entra ID to sign Kerberos tickets that your local Domain Controllers will inherently trust.

Deploying the WHfB Policy via Intune

With the infrastructure established, you must now instruct the Windows client devices to utilize the Cloud Trust method. This is most efficiently accomplished via Microsoft Intune.

1. Navigate to the Microsoft Intune admin center.
2. Select Devices > Windows > Configuration profiles > Create profile.
3. Select Windows 10 and later as the platform and Settings catalog as the profile type.
4. In the settings picker, search for Windows Hello for Business.
5. Select and configure the following required settings:
   • Use Windows Hello for Business: Enable
   • Use Cloud Trust for On-Premises Auth: Enable

Assign this policy to your pilot group of hybrid-joined devices. Upon the next MDM synchronization and subsequent device reboot, the user will be prompted to enroll in Windows Hello (registering their fingerprint, face, or PIN). Immediately following enrollment, the user can access both cloud-native M365 applications and on-premises SMB file shares utilizing a single, seamless, passwordless authentication gesture.