MC1551898 - Out-of-band update released to address Windows licensing and activation errors

Microsoft has released a new Windows out-of-band (OOB) update today, November 13, 2026, to address an issue that affects a limited number of enterprise devices after installing the November 2026 Windows security update. Certain Windows licensing and activation operations using the Software Licensing Management Tool (SLMGR) might fail with error 0x80041008 (Invalid parameter). This primarily affects organizations using slmgr.vbs commands or automated processes to configure Key Management Service (KMS) activation, install product keys, or manage Windows licensing. Devices that are already activated remain activated. This cumulative update includes the improvements from the November 2026 Windows security update. 

 

For Windows Server 2025, Windows Server 2022, Windows Server 2019, and the Windows 10 editions listed below, the optional non-security OOB update is available only from the Microsoft Update Catalog. For Windows 11, version 23H2, the optional non-security OOB update is available from the Microsoft Update Catalog and through Windows Update. Go to Settings > Windows Update > Advanced options > Optional updates to download and install it. 

 

For complete guidance and installation instructions, see the relevant KB articles: