KB5136493: Cumulative update for Windows 10, versions 21H2 and 22H2, November 2026. Error 0x80041008 fixed for certain SLMGR licensing tasks

Some organizations could see error 0x80041008 when using SLMGR for licensing or activation tasks; this update fixes the issue. It also improves checks for devices hosted on Azure.

Does it affect you? Applies to: Windows 10 version 22H2 devices in the Extended Security Updates program, and version 21H2 devices running Enterprise LTSC 2021 or IoT Enterprise LTSC 2021.

What changes

Fixes 2 changes

Licensing and Activation

2 items

For: Organizations using SLMGR commands or automated licensing processes

Some organizations could get an error while managing Windows activation or product keys. This fix applies to version 22H2.¹
Fixes error 0x80041008 in certain operations using the Software Licensing Management Tool (SLMGR). The issue primarily affected organizations using slmgr.vbs commands or automated processes for Key Management Service (KMS) activation, product keys, or Windows licensing. Already activated devices and existing KMS setups that needed no further slmgr.vbs commands were not affected.
Some organizations could get an error while managing Windows activation or product keys. This fix applies to version 21H2.¹
Fixes error 0x80041008 in certain operations using the Software Licensing Management Tool (SLMGR). The issue primarily affected organizations using slmgr.vbs commands or automated processes for Key Management Service (KMS) activation, product keys, or Windows licensing. Already activated devices and existing KMS setups that needed no further slmgr.vbs commands were not affected.

Improvement 1 change

Servicing stack

The servicing stack improves checks that identify devices hosted on Azure.²
SSU KB5132689, version 19041.7838, adds logic to verify whether a device is hosted on Azure, using an updated certificate chain for validation.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released: 2026-11-13
Classification: Updates
Type: Cumulative update
Restart: Required
Replaces: KB5131096, KB5134125, KB5126657, KB5129236

+43 earlier
KB5122878, KB5120249, KB5099539, KB5094127, KB5087544, KB5082200, KB5078885, KB5075912, KB5078129, KB5077796, KB5073724, KB5074976, KB5071546, KB5068781, KB5066791, KB5066198, KB5065429, KB5063842, KB5066188, KB5063709, KB5062649, KB5062554, KB5061087, KB5063159, KB5060533, KB5058481, KB5061979, KB5061768, KB5055612, KB5053643, KB5052077, KB5050081, KB5046714, KB5045594, KB5043131, KB5041582, KB5040525, KB5039299, KB5037849, KB5036979, KB5035941, KB5034843, KB5034203

Version	Build	Channel
21H2	19044.7850	General availability
22H2	19045.7850	General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 21H2 / 22H2

1.2 GB

windows10.0-kb5136493-x64.msu Main update · KB5136493 SHA-1: 11be8880…e339bc

Arm64 21H2 / 22H2

858.6 MB

windows10.0-kb5136493-arm64.msu Main update · KB5136493 SHA-1: 7e4d982d…1fdced

x86 21H2 / 22H2

566.0 MB

windows10.0-kb5136493-x86.msu Main update · KB5136493 SHA-1: 20445b8a…28287c

Updated components

1,006 files changed since the previous update for the same versions.

Top changed components	Files
Graphics and display	14
Hyper-V and virtualization	9
File Explorer and shell	7
Kernel	7
Secure Boot	7
Networking	6
Security and sign-in	6
Remote Desktop	5
Storage and file systems	5
Printing	2
Windows Update	2
Audio	1

Page history

Nov 14, 2026

Now also covers build 19044.7850 (21H2)

Now also covers build 19045.7850 (22H2)

Sources

Microsoft Support: KB5136493

Updated Nov 14, 2026

Cited passages from Microsoft's official notes (2)

1. Fixed: An issue where certain Windows licensing and activation operations using the Software Licensing Management Tool (SLMGR) might fail with error 0x80041008 (Invalid parameter). support.microsoft.com
2. This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation. support.microsoft.com

Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Nov 15, 2026

Quotes found in the official pages: passed
Numbers found in the sources: passed
Vulnerabilities from the dossier only: passed
Links to allowed domains only: passed
Every official change covered: passed
Readable plain text: passed
Changes confirmed by the file list: passed
Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake