Microsoft released emergency Windows updates for activation error 0x80041008

This is a new development in a story we reported earlier: Microsoft releases Windows 10 KB5131096 Extended security update.

Microsoft’s emergency out-of-band updates shipped on Nov. 13, 2026, to resolve Windows activation error 0x80041008 caused by the November updates. The activation failures began after the Nov. 10, 2026, Patch Tuesday security updates, Microsoft said. The company has not explained what caused the failures. Microsoft classifies the emergency update as cumulative, not security-related.

The problem primarily affects organizations using Key Management Service activation, automated processes, or slmgr.vbs commands for licensing, not home users. Error 0x80041008 appears when Software Licensing Management Tool commands fail, especially slmgr.vbs /skms-domain and slmgr.vbs /ipk for Key Management Service setup and product key installation. BetaNews says the impact could have been immense for all users but mainly affected organizations using Key Management Service rather than home users. Microsoft says the fix addresses license management operation failures, not widespread system activation failures.

Microsoft says already activated devices stay activated, and devices with existing Key Management Service configurations that do not need slmgr.vbs commands remain unaffected. “Devices that were already activated remained activated, and devices with existing KMS configurations that did not require additional slmgr.vbs commands were not affected.”

The emergency updates include improvements from the Nov. 10 cumulative release. Microsoft Windows Release Health documentation acknowledges the activation issue.

Microsoft issued KB5136489 for Windows Server 2025 and KB5136487 for Windows Server 2022 as emergency updates. KB5136490 covers Windows Server 2019 and Windows 10 Enterprise LTSC 2019. KB5136483 covers Windows 11 version 23H2.

KB5136493 covers Windows 10 version 22H2 ESU and Windows 10 Enterprise LTSC 2021; it also applies to Windows 10 IoT Enterprise LTSC 2021 with post-installation versions 19044.7850 or 19045.7850.

Administrators can install the emergency updates through Windows Update, standalone packages from the Microsoft Update Catalog, or Windows Server Update Services. After installation, administrators should verify product key installation, Key Management Service configuration, and automated activation processes.