Azue AD Device Management

You may identify and Remove Duplicate Devices by the following:

1. Check Device Join Type

Go to Azure Portal → Microsoft Entra ID → Devices and look at the Join Type:

• Azure AD Registered: Typically personal devices or manually joined.
• Azure AD Joined: Corporate-owned devices.
• Hybrid Azure AD Joined: On-prem AD devices synced via Azure AD Connect.

2. Compare Device Names and Owners

• Look for devices with the same name (e.g., DT-23) but different owners or join types.
• Use PowerShell to export device info:

Get-AzureADDevice | Select DisplayName, DeviceId, DeviceTrustType, ApproximateLastLogonTimestamp | Export-Csv Devices.csv

• Cross-reference with your actual inventory to identify stale or duplicate entries.

3. Delete Stale or Duplicate Devices

• In the Azure Portal, go to Devices → All Devices.
• Filter by Last Activity Date — remove devices that haven’t been active in 30+ days.
• You can also bulk delete via PowerShell:

Remove-AzureADDevice -ObjectId <DeviceId>

For preventing future Duplicates:

Use Device Cleanup Rules in Intune

• Go to Intune → Devices → Device Cleanup Rules
• Set rules to automatically remove inactive devices after X days.

Avoid Manual Re-registration

Re-registering devices without removing the old entry first can cause duplicates. Always:

• Remove the old device from Azure AD before rejoining.
• Use scripts or Autopilot for consistent provisioning.

Monitor with Reports