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Discover how to retrieve the `samaccountname` of an Active Directory user using their `User Principal Name (UPN)` in PowerShell.
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This video is based on the question https://stackoverflow.com/q/73586495/ asked by the user 'ak2595' ( https://stackoverflow.com/u/17163818/ ) and on the answer https://stackoverflow.com/a/73586732/ provided by the user 'Jeff Zeitlin' ( https://stackoverflow.com/u/6083222/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Find an AD User's samaccountname by Their upn

When working with Active Directory (AD), you often need to retrieve various user attributes. One common task is finding a user's samaccountname using their User Principal Name (UPN). The ability to map these two identifiers can streamline processes and improve efficiency, especially for administrators dealing with large datasets. In this guide, we’ll walk through how to achieve this using PowerShell.

The Problem: Locating the samaccountname

You may have a list of UPNs, and your goal is to find the corresponding samaccountname for each user in your Active Directory. While a basic script might get you started, it's important to ensure the syntax and logic are correct to avoid issues during execution.

The Solution: Using PowerShell

To find the samaccountname by UPN, you need to perform the following steps using a PowerShell script. Let’s break this down into manageable parts:

Step 1: Prepare Your User List

First, you need to define the UPNs you want to search for. In PowerShell, this can be done using a CSV format, as shown below:

[[See Video to Reveal this Text or Code Snippet]]

This snippet creates an array of users containing their UPNs, which will be used later in the script.

Step 2: Loop Through Each User

Next, you’ll want to loop through the list of users and execute a search to retrieve the samaccountname. The PowerShell cmdlet Get-ADUser can be very helpful here.

Here's the modified code to correctly filter by UserPrincipalName:

[[See Video to Reveal this Text or Code Snippet]]

Important Syntax Considerations

Correct Filtering: The filter in the Get-ADUser cmdlet must be treated as a string rather than a script block. By enclosing it in quotes, you explicitly set it as a string rather than a code block, which helps avoid script errors during execution.

Evaluating Variables: When referencing a variable in a string, use the $(...) syntax for proper evaluation. This ensures that the script evaluates $user.upn correctly.

Full PowerShell Script

Here’s the complete script combining all the steps:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can easily find the samaccountname of users in Active Directory based on their UPN. This process not only enhances your script's accuracy but also helps you manage user information more effectively.

If you have questions or further insights about working with PowerShell and Active Directory, feel free to share in the comments below!