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Error 0x8018000a: Device Already Enrolled by Different User

Error Message

Something went wrong. The device is already enrolled. You can contact your system administrator with the error code 8018000a.

Error Details​

PropertyValue
Error Code (Hex)0x8018000a
Error Code (Dec)-2147418102

Description​

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This error occurs when attempting to enroll a device that has already been enrolled in Intune or joined to Microsoft Entra ID by a different user. The error indicates a user-level enrollment conflict that requires removal of the existing work or school account before proceeding with new enrollment.

Common Causes​

👥 User Account Conflicts​

Enrollment conflicts often arise from multiple user scenarios. Another user may have previously enrolled the device. Existing Microsoft Entra ID join state could prevent new enrollment. Work or school accounts from other users might remain on system. Understanding user-level enrollment management is crucial for resolution.

🔄 Account State Management​

Account-related complications can prevent new enrollments. Previous work/school connections might persist on device. User profile conflicts could affect enrollment capability. Account cleanup requires proper user context for removal. These management factors require systematic resolution approach.

Resolution Steps​

1️⃣ Account Verification​

Begin by checking existing work or school accounts:

  1. Go to Settings > Accounts > Work Access
  2. Look for message indicating another user's connection
  3. Document existing account details
  4. Note which user account has active enrollment

2️⃣ Account Removal​

Remove existing work or school account:

  1. Sign out of current Windows session
  2. Sign in using account that originally enrolled device
  3. Navigate to Settings > Accounts > Work Access
  4. Remove work or school account connection

3️⃣ New Enrollment​

Proceed with new enrollment process:

  1. Sign out after removing account
  2. Sign in with account requiring enrollment
  3. Initiate device enrollment or Microsoft Entra ID join
  4. Verify successful completion

Best Practices​

👨‍💻 For IT Administrators​

Effective enrollment management requires attention to user account states. Implement comprehensive enrollment tracking systems. Maintain documentation of user enrollment states. Develop clear procedures for handling account conflicts. Create systematic approaches to enrollment transitions. Consider implementing automated account state monitoring.

👥 For User Management​

Successful enrollment requires clear user account management. Develop processes for transitioning device enrollments. Maintain accurate documentation of enrolled accounts. Implement thorough testing procedures for enrollment changes. Create comprehensive documentation of account cleanup steps.

Troubleshooting Tips​

Account Management

When addressing enrollment conflicts, focus on proper account context. Ensure correct user account for removal steps. Verify complete removal of work/school accounts. Test enrollment with new account. Monitor for successful transition.

Important Considerations

Account transitions require careful handling. User data may need preservation. Multiple accounts might be affected. Consider timing of account changes. Monitor enrollment completion carefully.

Additional Notes​

💡 User context important

🔄 Account removal required

⚠️ Sign-in transitions needed

👥 Multiple users affected

Intune Docs

Account Guide

Entra ID Guide

Account Transition Guide​

  1. Current State Assessment

    • Check enrolled accounts
    • Identify active enrollment
    • Document account details
    • Plan transition steps

  2. Account Cleanup

    • Switch user contexts
    • Remove work accounts
    • Verify removal complete
    • Document changes

  3. New Enrollment Process

    • Prepare new account
    • Complete enrollment
    • Verify success
    • Monitor status
Best Practice

Maintain clear documentation of account transitions and ensure proper user context when removing existing work or school accounts to prevent enrollment issues.