Microsoft released out-of-band updates on November 13 to fix a licensing bug in Windows 10, Windows 11, and Windows Server caused by the November 2026 Patch Tuesday. The bug affected specific slmgr.vbs activation commands, leading to errors primarily impacting IT administrators using automated deployment scripts, while most already-activated devices remained unaffected. These cumulative updates are available only through the Microsoft Update Catalog and do not sync to WSUS or Configuration Manager, requiring manual deployment by administrators. The swift response from Microsoft addressed the issue within three days, though organizations utilizing KMS client keys in their scripts faced the most significant disruptions during this brief period

Microsoft Releases Windows Out-of-Band Fix for Activation Bug

Microsoft released out-of-band updates on November 13 that repair a licensing bug introduced by the November 2026 Patch Tuesday across Windows 10, Windows 11, and Windows Server. The bug breaks slmgr.vbs activation commands like /ipk and /skms-domain, failing with error 0x80041008. Most PCs won't notice, since already-activated devices stay activated, but IT admins running automated deployment and re-key scripts take the hit. The fixes are non-security and cumulative, available only through the Microsoft Update Catalog, and they don't sync to WSUS or Configuration Manager.

Microsoft Releases Windows Out-of-Band Fix for Activation Bug @ NT Compatible