Opselith
POWERSHELL / MICROSOFT.GRAPH.DEVICEMANAGEMENT
FreeIntermediateRead-onlylow

Find duplicate Intune serial numbers

Find Microsoft Intune managed-device records that share the same nonblank serial number and export them to CSV.

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Generated locally in your browser · Review before running · Opselith does not connect to your tenant

What this PowerShell script does

Finds multiple managed devices sharing the same serial number.

Requirements

  • CSV output path - Example: C:\Temp\report.csv

Environment

  • Module: Microsoft.Graph.DeviceManagement
  • Permissions: DeviceManagementManagedDevices.Read.All
  • Output: CSV report
  • Context: PowerShell 7 · Microsoft Graph
  • Risk: Low
Review before you run The script is generated locally. Test outside production first.
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Ready to generate

Configure Find duplicate Intune serial numbers in the Builder, review the generated PowerShell and run it yourself in your own PowerShell session.

Configure this script →Open Builder
More about this script

Why use this template?

Use this PowerShell template when you need to find multiple managed devices sharing the same serial number. It is generated locally and can be reviewed before you run it yourself in your own PowerShell session.

The template uses Microsoft.Graph.DeviceManagement and requires DeviceManagementManagedDevices.Read.All. Output: CSV report. Level: Intermediate. Action: Read-only. Risk: Low.

Review before running

The script is generated in your browser. Read it before you run it, and test it outside production first. “Read-only” describes the script itself; anything you add around it can still change data.

Generate the script

  1. Open the template in the PowerShell Builder.
  2. Enter the requested values and review the module, permissions, output and risk.
  3. Generate the script, read it carefully, and test it outside production before use.

The script is generated locally in your browser. Nothing needs to be uploaded to Opselith.

Generate Find duplicate Intune serial numbers →

How to use this result

Use this report to group managed-device records by SerialNumber and return serials that appear more than once.

When this helps

  • Find potential duplicate or re-enrolled managed-device records during cleanup.
  • Compare device IDs, names, users and compliance state for records sharing a serial number.

How to read the result

  • DuplicateCount is the number of Intune managed-device records sharing that nonblank serial value.
  • A repeated serial can indicate duplicate/re-enrolled records, but it can also reflect vendor or inventory-data quirks that require verification.

Things to check

  • Blank serial numbers are excluded rather than grouped together.
  • Do not delete duplicate-looking records until you have identified the current active enrollment and related Entra/Autopilot identity.

What to do next: Compare last sync, device IDs, enrollment context and Autopilot/Entra records to determine which records are current.

Related tasks

Official references

Before you runModule, permissions, inputs, compatibility and script checks
OPS / SCRIPT DETAILS

Script details

Finds multiple managed devices sharing the same serial number. Review these details before generating or running the script.

intunefinddeviceentrareporting
Generated here. Run by you.Opselith does not connect to your tenant or run PowerShell. After generating, review the script and run it in your own PowerShell session.

What it works with

Module: Microsoft.Graph.DeviceManagement

Microsoft Graph PowerShell lets the script work with Microsoft Entra and Microsoft 365 data through Microsoft Graph.

Context: PowerShell 7 · Microsoft Graph

Compatibility: PowerShell 7 is the supported target for this Microsoft 365 template.

Permissions and changes

Permissions: DeviceManagementManagedDevices.Read.All

Risk: Low

Read-only: designed to collect information without intentionally changing the target environment.

Changes: Read-only. The script reads data and does not intentionally change the target environment.

Inputs

  • CSV output path - Example: C:\Temp\report.csv (Required)

What to expect

Output: CSV report

Expect a CSV file at the path you choose. Open it in Excel or another CSV viewer and review the rows.

Example: C:\Temp\report.csv

This template is in the Free library and is generated locally in your browser. Opselith does not run it; you review and run the script in your own PowerShell session.

Example use

Finds multiple managed devices sharing the same serial number.

Enter the required values in the Builder, review the generated script and confirm the output before running it.

Before you run: Make sure your account has DeviceManagementManagedDevices.Read.All. Check that the Microsoft.Graph.DeviceManagement PowerShell module is available and that you are using the supported PowerShell version. Review the generated script and output path, then test outside production first.
Script checksWhat has been verifiedQA reviewed
Static checksPassed
PSScriptAnalyzerPending
Real-world run testNot yet recorded
Last checkedNot yet recorded

Real-world run results are shown only after Opselith reviews and accepts a tester report.

Tester: report a result →
TEST STATUSWhat Opselith has checked

Last reviewed: 10 Sept 2026

PSScriptAnalyzer: Awaiting a release PSScriptAnalyzer gate that includes this script. No analyzer pass is claimed yet.

Pending or Not yet recorded means there is no accepted result on file yet. A passed analyzer check does not mean the script has been run in a real tenant.

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