License & Subscription Issues

How to Fix Set-MsolUserLicense Unknown Errors in PowerShell

John Wilson Oct 10, 2026 868 views

Question details

Administrators need to resolve errors encountered when trying to manage Microsoft 365 user licenses via PowerShell.

How to Fix Set-MsolUserLicense Unknown Errors in PowerShell

Product: Microsoft 365 / PowerShell
Device & OS: not provided
Scenario: Attempting to assign, modify, or remove a user's license using the Set-MsolUserLicense PowerShell cmdlet.
Observed behavior: The command fails to execute, returning an OperationNotAllowedException or an unspecified unknown error instead of updating the license.

Before you start

Ensure you have Global Administrator or License Administrator privileges in your Microsoft 365 tenant before attempting to modify user licenses via PowerShell.

Solution 1Recommended

Verify and Modify Group-Based Licensing

Resolve the OperationNotAllowedException by checking if the license is inherited from an Azure AD group rather than assigned directly.

If a user's license is managed through group-based licensing, you cannot use Set-MsolUserLicense to modify or remove it directly. Modifying directly assigned licenses works, but attempting to remove inherited licenses will trigger an operation exception.

Check license assignment method

Log in to the Microsoft Entra admin center or the Microsoft 365 admin portal. Navigate to the specific user's profile and click on 'Licenses' to see if the assignment path is 'Direct' or 'Inherited'.

Remove user from licensing group

If the license is inherited via a group, navigate to 'Groups' in the admin center, locate the specific licensing group, and remove the user from the group members list instead of running the PowerShell command.

Group Sync Delay: After removing a user from a licensing group, it may take a few minutes for the backend sync to process the license removal.

Solution 2

Migrate Scripts to Microsoft Graph PowerShell

Transition away from the deprecated MSOnline module to Microsoft Graph to prevent unknown execution errors and ensure ongoing support.

Solution 3

Wait and Retry the Command

Bypass temporary backend sync delays or transient server issues that occasionally trigger unknown errors.

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Frequently Asked Questions

Why is the MSOnline module throwing unknown errors suddenly?

The MSOnline module has been officially deprecated by Microsoft. Using deprecated modules can cause unexpected backend communication failures, resulting in unknown errors. Administrators are strongly advised to migrate to the Microsoft Graph PowerShell module.

Can I remove a group-assigned license using Set-MsolUserLicense?

No. If a Microsoft 365 license is assigned via a group, it cannot be modified or removed directly using user-level PowerShell cmdlets. You must remove the user from the respective licensing group to revoke their access.

What does OperationNotAllowedException mean in PowerShell licensing?

This exception typically indicates that you are attempting an action that violates the tenant's licensing rules, such as manually trying to strip a license that is automatically enforced by an Azure AD (Entra) group membership.

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