Fix Intune Enrollment Error 8018000a "Device Already Enrolled"

You're trying to enroll a device in Intune or Azure AD and get "Something went wrong. The device is already enrolled. Error code 8018000a." This happens when the device was removed from Intune but leftover enrollment records still exist in the registry.

The Fix

First, confirm the device isn't actually enrolled:

dsregcmd /status

If AzureAdJoined shows NO but you still get the error, clear the orphaned enrollment entries:

# Run as Administrator
$enrollments = "HKLM:\SOFTWARE\Microsoft\Enrollments"
Get-ChildItem $enrollments | Where-Object {
$_.PSChildName -notin @("Context","Ownership","Status","ValidNodePaths")
} | Remove-Item -Recurse -Force

Restart the device and try enrolling again.