Windows 11 Home activation fails with 0xC004C060 after SSD replacement

Question

Windows 11 Home activation fails with 0xC004C060 after SSD replacement

Levy 0

I have a Vibox desktop PC that originally came with Windows 11 Home and was activated normally for over two years.

The original SSD failed, so I replaced only the SSD. The motherboard, CPU and other hardware have not been changed. I then performed a clean installation of Windows 11 Home using Microsoft installation media and selected “I don’t have a product key” during setup.

Vibox provided the original Windows 11 Home OEM product key, but activation now fails with error 0xC004C060.

I have already tried:

Windows Activation Troubleshooter
“I changed hardware on this device recently”
Microsoft Product Activation Portal
Installation ID / Confirmation ID process
SLUI 4
Date, time and time-zone synchronization
The generic Windows 11 Home key method suggested by Vibox

The Microsoft Product Activation Portal does not provide a Confirmation ID. On one attempt, it returned:

“Unfortunately, we cannot complete the transaction as our records do not recognize this as a valid product.”

I also generated a new Installation ID and tried the Product Activation Portal again. This time, the portal returned:

“We’re sorry, your Installation ID was unable to be validated.”

My Microsoft account still shows this PC in the device list, but the Activation Troubleshooter says that there is no linked device that can be used to reactivate Windows.

I have also been unable to reach a human Microsoft activation agent because the support system keeps redirecting me back to the Product Activation Portal.

Could someone please explain whether this OEM licence/key has been blocked or invalidated, and how I can have Microsoft check or reactivate the original licence?

I can provide screenshots of the activation error and Product Activation Portal results if required.

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1 answer

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Answer 1

DaveM121 939.1K Independent Advisor

The error 0xC004C060 does indicate the product key is invalid or blocked.

1

Click your Start Button, type cmd then right click Command Prompt and choose 'Run as Administrator'

Run or paste this command and hit Enter:

slmgr.vbs /dlv

Please post a screenshot of the resulting dialog

3

Download the free ShowKeyPlus app from the Microsoft Store.

On the left of that app, click 'Check Edition', then enter your product key into that app.

Please provide a screenshot of that app window and please hide your product key in the screenshot.

Levy 0 Reputation points

2026-10-09T11:14:19.04+00:00

Thank you. I checked the key with ShowKeyPlus. It reports:

Edition: Win 10 RTM Core OEM**:DM** EULA: OEM

I have also attached the latest slmgr.vbs /dlv screenshot, which shows OEM:DM, partial key 9W3DQ, and License Status: Notification.

The same key still fails activation with 0xC004C060, and the Product Activation Portal cannot validate the Installation ID.
DaveM121 939.1K Reputation points Independent Advisor

2026-10-09T11:18:50.0833333+00:00

Thank you for the screenshots, that does indicate that is a correct PC manufacturers OEM licence.

Open ShowKeyPlus again, please provide a screenshot of that full initial window in the app and please hide any product keys in the screenshot.
Levy 0 Reputation points

2026-10-09T11:48:07.9766667+00:00

Thank you. Here is the full ShowKeyPlus Home screen. I have hidden the full installed product key. It shows Windows 11 Home, the installed key ending in 9W3DQ, and “OEM key not present in firmware”.
DaveM121 939.1K Reputation points Independent Advisor

2026-10-09T11:51:39.8633333+00:00

Thank you for the screenshot, if the troubleshoot method is not resolving the activation errors, the only option is to contact Microsoft Support directly, provide them with your product key, they can test that key and if it is correct, they can reactivate your Windows licence for you.
Levy 0 Reputation points

2026-10-09T12:02:29.89+00:00

Thank you. The main difficulty is that I have been unable to reach a human Microsoft activation agent. The phone support redirects me to the Product Activation Portal, and the online support system keeps looping back to automated troubleshooting. Could you please advise the current way to reach a Microsoft Support agent who can manually check the product key?
DaveM121 939.1K Reputation points Independent Advisor

2026-10-09T12:09:24.08+00:00

Their support is very hard to contact, it is mainly online AI and bots, I am not familiar with the methods to contact their support in all locations, if you are unable to find a working phone number, try opening the Get Help app and repeatedly ask the bot in that app to 'speak to a person', you may eventually get a link to speak to their support via live chat support.
Levy 0 Reputation points

2026-10-09T12:14:49.58+00:00

Thank you. Unfortunately, I still cannot reach a human Microsoft support agent.

In the Get Help app, when I try to contact support, my personal Microsoft account is redirected to an organisational sign-in page and fails with error AADSTS50020.

I also tried the web-based Support Assistant. It gives me a Contact support button, but that only sends me back to the product selection page. If I select Windows activation, it redirects me again to the Microsoft Product Activation Portal, where my Installation ID cannot be validated.

So both Get Help and the web support flow are effectively looping back to automated activation and I still cannot reach a human agent.

Is there any direct live chat, callback link, or other way for a UK home user to reach a Microsoft activation specialist?
DaveM121 939.1K Reputation points Independent Advisor

2026-10-09T12:21:34.92+00:00

That is the only alternative method I know of to try to contact their support.

As a workaround, try this method to contact Microsoft 365 support, they may then be able to transfer you to Windows Support.

Go to this link: https://support.microsoft.com/contactus

Select Microsoft 365

Click 'Get Home Support'.

In the box provided, type billing.

Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.

Navigate to Microsoft 365 and Office - Manage my Subscription.

Select the 'Chat with support agent in web browser' option