Step-by-Step Guide to Fix Error 0x801C03F9

0x801C03F9 Error: Azure AD Join Failed – MDM Enrollment or Policy Conf

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What is 0x801C03F9 Error?


The Windows error 0x801C03F9 typically occurs when attempting to join a Windows device to Azure Active Directory (Azure AD) or enroll it in Mobile Device Management (MDM). Users often encounter this issue during out-of-box setup (OOBE), Windows Autopilot provisioning, or manual device registration. The message indicates a failure in the policy or configuration framework, often related to MDM restrictions or sync failures with Azure services.

Causes

  • Network Timeout or Connectivity Failure: The device cannot reach Azure AD or MDM endpoints during the join process.
  • Intune Enrollment Restrictions: The device or user may be blocked from enrollment due to policy-based restrictions in Microsoft Intune.
  • Exceeding Device Limit: The user has reached the maximum allowed devices registered under their Azure AD account.
  • Corrupt MDM or AAD Join Cache: Previous failed attempts may leave behind invalid tokens or cached entries.
  • Improper Autopilot Profile Assignment: The assigned deployment profile may be missing or misconfigured in Windows Autopilot.
  • Outdated Windows Version: An older OS build may lack compatibility with current Azure AD or Intune policies.

Resolution Steps




1.Ensure Stable Network Connection

Make sure the device is connected to a stable and unrestricted network. Avoid guest Wi-Fi or VPNs that may block access to Microsoft’s enrollment or policy servers.

2.Verify User Device Enrollment Limit in Azure AD

Log in to the Azure portal → Azure Active Directory → Devices → Device Settings. Check if the user has reached the maximum number of devices allowed (default is 5). Either raise the limit or remove older devices.

3.Review Intune Enrollment Restrictions

Go to Microsoft Endpoint Manager Admin Center → Devices → Enrollment Restrictions and confirm that the user and device platform are allowed to enroll. Update any conflicting configuration settings.

4.Run dsregcmd to Leave Azure AD (if previously joined)

  • Open Command Prompt as Administrator and run:
  • dsregcmd /leave
  • Then restart the computer to clear any residual Azure AD or MDM binding.

5.Clear MDM Enrollment and Join Registry Entries (Advanced)

  • Open Registry Editor, navigate to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Enrollments  

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Enrollments\Status  

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\MDM

  • Delete any stale enrollment records. Back up the registry before making any changes.

6.Ensure Autopilot Profile Is Correctly Assigned

If you're using Windows Autopilot, verify that the device is listed under Devices → Windows Autopilot Devices and has a Deployment Profile assigned. Reassign or reimport the device hash if needed.

7.Sync Device Manually from Access Work or School Account

Navigate to Settings → Accounts → Access work or school, select the organization account, and click Info → Sync to manually initiate the policy and device sync.

  1. Update Windows to the Latest Version

Go to Settings → Windows Update, install all pending updates, and ensure the device is running a supported build. Azure AD join and Intune compatibility require modern OS versions.

8.Check Group Policy and MDM Settings

  • Open Local Group Policy Editor (gpedit.msc) and ensure MDM enrollment is enabled under:
  • Computer Configuration → Administrative Templates → Windows Components → MDM
  • Also verify that no conflicting policies are disabling device registration.

9.Contact IT Administrator or Microsoft Support

If the issue persists, especially in managed enterprise environments, escalate the issue to your IT admin or Microsoft support. They can verify backend configurations, user assignments, and licensing issues that might block device registration.


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