After the November 2026 Patch Tuesday security update, Windows activation commands fail with 0x80041008, Invalid parameter (SWbemObjectEx). The commands hit are slmgr.vbs /skms-domain and slmgr.vbs /ipk. Microsoft shipped an emergency out-of-band fix on November 13, 2026 — install it and the commands work again. The good news: your Windows is almost certainly still activated. The bug breaks the licensing tool, not the license.
Quick Fix Summary
- Problem:
slmgr.vbscommands fail with0x80041008, Invalid parameter (SWbemObjectEx)after the November 2026 security update.- Fix: UPDATE Nov 13, 2026: Microsoft shipped an emergency out-of-band fix — install KB5136483 (Windows 11 23H2), KB5136493 (Windows 10 22H2 ESU/LTSC 2021), KB5136489 (Server 2025), KB5136487 (Server 2022), or KB5136490 (Server 2019 / LTSC 2019) and the commands work again. If you cannot install it yet, contact Microsoft Support for Business.
- Do not: Re-run activation commands or reinstall product keys — devices that are already activated stay activated.
Technical Root Cause
| Error Code | Affected Version | Root Cause | Current Status |
|---|---|---|---|
| 0x80041008 Invalid parameter (SWbemObjectEx) | Windows 11 23H2, Windows 10 22H2/21H2, Windows Server 2025/2022/2019 | November 2026 security update breaks slmgr.vbs licensing calls — seen on /skms-domain and /ipk |
Fixed — emergency out-of-band update released Nov 13, 2026 (KB5136483 / KB5136493 / KB5136489 / KB5136487 / KB5136490) |
Step-by-Step: What to Do About 0x80041008
Step 1 — Check Whether You Are Actually Activated (No slmgr Needed)
Open Settings → System → Activation. If it says “Windows is activated”, stop — your license is fine and only the tool is broken.
You can also check from PowerShell without touching slmgr:
Get-CimInstance SoftwareLicensingProduct | Where-Object PartialProductKey | Select-Object Name, LicenseStatusLicenseStatus 1 means Licensed.
Step 2 — Do Not Re-Run the Failing Commands
These two commands fail with 0x80041008 until Microsoft’s fix lands:
slmgr.vbs /skms-domain
slmgr.vbs /ipk YOUR-PRODUCT-KEYBefore the November 13 fix, re-running them changed nothing — install the fix in Step 4 first, then re-run. Do not reinstall your product key to “fix” the error — /ipk is one of the broken commands, and a key you do not need to touch is a key you cannot break.
If you run activation across a fleet, stop hand-running slmgr
This bug hits IT admins hardest — the ones who automate activation with slmgr scripts across dozens or hundreds of machines. ManageEngine Endpoint Central manages licensing, patching, and configuration from one console instead of a script you run machine by machine, so one broken tool does not stop a whole rollout. (Affiliate link — DebugRadar earns a commission if you sign up through it.)
Step 3 — If You Must Change a Key or KMS Host Right Now
If you are deploying new machines and cannot wait — for example, you need to point clients at a new KMS host — contact Microsoft Support for Business. That is Microsoft’s interim workaround while the fix is prepared. Have your error code (0x80041008), the exact command that failed, and your Windows version ready when you call.
Step 4 — Install the Emergency Fix (Released Nov 13, 2026)
Install the out-of-band update for your version — KB5136483 (Windows 11 23H2), KB5136493 (Windows 10 22H2 ESU/LTSC 2021), KB5136489 (Server 2025), KB5136487 (Server 2022), or KB5136490 (Server 2019 / LTSC 2019). Windows 11 23H2 users can also get it from Windows Update → Optional updates; Server and Windows 10 editions can grab it from the Microsoft Update Catalog. After it installs, re-run the command that failed — it should complete without the error.
FAQ
Is my Windows deactivated?
No. Devices that are already activated stay activated. The bug breaks the slmgr.vbs tool, not the license itself. Check Settings → System → Activation to confirm.
Can I fix it by reinstalling my product key?
No — and you do not need to. Install the November 13 out-of-band update (KB5136483 / KB5136493), then re-run the command. Reinstalling the key was never the fix.
When is the fix coming?
It is here: Microsoft released the emergency out-of-band fix on November 13, 2026 — KB5136483 for Windows 11 23H2, KB5136493 for Windows 10 22H2, and matching KBs for Windows Server. Install it, then re-run the command.
Sources: The Register, November 12, 2026 (theregister.com). Update: Neowin, November 13, 2026 (neowin.net) — emergency out-of-band fix released.
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