License & Subscription Issues

Fix Set-MsolUserLicense Unknown Error in PowerShell for Microsoft 365

Rana Garcia Oct 12, 2026 868 views

Question details

The user needs to resolve an Unknown error returned by the Set-MsolUserLicense command when trying to assign a Microsoft 365 license.

How to Fix Set-MsolUserLicense Unknown Error in PowerShell

Product: Microsoft 365
Device & OS: not provided
Scenario: Assigning or modifying Microsoft 365 user licenses programmatically via PowerShell.
Observed behavior: The Set-MsolUserLicense cmdlet fails and outputs an Unknown error, preventing the user from receiving their assigned Microsoft 365 service plan.

Before you start

Ensure you are running PowerShell as an Administrator, that you have Global Administrator privileges in your Microsoft 365 tenant, and that the MSOnline module is properly authenticated using Connect-MsolService.

Solution 1Recommended

Verify and Set User Usage Location

A missing usage location is the most common trigger for license assignment errors, as Microsoft requires regional data to allocate services legally.

Microsoft 365 cannot assign a license to a user account that does not have a defined 'UsageLocation'. This is a mandatory property to comply with regional data laws and service availability.

Check current usage location

Run the command 'Get-MsolUser -UserPrincipalName user@yourdomain.com | Select-Object UsageLocation' to see if the value is blank.

Set the usage location

If the result is empty, assign a valid two-letter country code (e.g., US or UK) by running 'Set-MsolUser -UserPrincipalName user@yourdomain.com -UsageLocation "US"'.

Retry the license assignment

Execute your original 'Set-MsolUserLicense' command again to see if the error is resolved.

Module Authentication: Always remember to run 'Connect-MsolService' before executing these commands to ensure you have an active session with the Microsoft 365 backend.

Solution 2

Validate AccountSkuId and Service Plans

Incorrectly formatted or unavailable SKU IDs will cause the license assignment cmdlet to fail.

Solution 3

Open a Microsoft 365 Service Request

If manual assignment fails both in PowerShell and the Admin Center, backend synchronization issues may require Microsoft Support.

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Frequently Asked Questions

Why does Microsoft 365 PowerShell require a Usage Location?

Microsoft 365 services, features, and compliance policies are tied to regional laws. Setting a usage location ensures that Microsoft only allocates features that are legally available in the user's geographical region.

Is the Set-MsolUserLicense command being deprecated?

Yes, Microsoft is actively deprecating the MSOnline (MSOL) and Azure AD PowerShell modules. Administrators are strongly encouraged to migrate their license management scripts to the Microsoft Graph PowerShell SDK using the Set-MgUserLicense cmdlet.

Can I assign multiple Microsoft 365 licenses at once using PowerShell?

Yes, you can assign multiple licenses by passing an array of valid AccountSkuIds. For example: Set-MsolUserLicense -AddLicenses "tenant:SKU1", "tenant:SKU2".

What if I get the same Unknown Error in the Microsoft 365 Admin Center?

If you cannot assign a license manually via the web-based Admin Center either, it usually indicates a backend synchronization issue with your tenant. In this case, opening a service request with Microsoft Support is necessary.

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