Step 1: Verify Configuration

✅ Licenses & Permissions

• Ensure the enrolling user has a valid Intune license.
• Confirm auto-enrollment is enabled for users in:
  Microsoft Entra ID > MDM/MAM > Microsoft Intune (set MDM scope = All, MAM scope = None).

✅ Device Requirements

• Windows 10/11, version 1709+.
• Hybrid Azure AD Joined: Run dsregcmd /status and verify:plaintextCopyAzureAdJoined: YES DomainJoined: YES AzureAdPrt: YES

✅ Group Policy Settings

• Verify GPO is applied:
  Computer Config > Policies > Admin Templates > Windows Components > MDM
  → Enable “Automatic MDM enrollment using default Microsoft Entra credentials”.

✅ Microsoft Entra & Intune Settings

• Entra ID: Allow “Users may join devices to Azure AD” (set to All).
• Intune: Ensure Windows enrollment is allowed under Enrollment Restrictions.

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Step 2: Check Logs

🔍 Event Viewer

• Navigate to:
  Applications and Services Logs > Microsoft > Windows > DeviceManagement-Enterprise-Diagnostic-Provider > Admin
  • Event ID 75: Auto-enrollment succeeded.
  • Event ID 76: Auto-enrollment failed (e.g., error 0x8018002b).

🔍 Task Scheduler

• Check task:
  Task Scheduler > Microsoft > Windows > EnterpriseMgmt
  • Event ID 102: Task completed (success/failure).
  • Event ID 107: Task triggered.
  • Event ID 7016: Conflict with another MDM (error 2149056522).

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Step 3: Troubleshoot Failures

🚨 Common Issues & Fixes

1. MDM Conflict:
   • Unenroll the device from other MDM providers.
2. Group Policy Not Applied:
   • Run gpupdate /force and verify GPO replication.
3. SCP Misconfiguration:
   • Ensure Service Connection Point (SCP) is published via Microsoft Entra Connect.
4. Classic Agent Enrollment:
   • Remove legacy Intune PC agent (causes error 0x80180026).

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Pro Tips

• Force Retry: Restart the device or manually trigger the scheduled task.
• Conditional Access: Bypass MFA prompts via Entra ID Conditional Access Policies.
• Logs: Use Intune Enrollment Diagnostics for deeper analysis.

Refrence : https://learn.microsoft.com/en-us/troubleshoot/mem/intune/device-enrollment/troubleshoot-windows-auto-enrollment