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Hi,
Recently I had to change the hardware in my desktop PC – motherboard and CPU. Now I’m having a problem with Windows activation.
I get this message:
We can't activate Windows on this device because the product key was already used on another device. If you think it wasn't used on another device, select Troubleshoot below. Error code: 0xC004C008
When I click Troubleshoot and select I changed hardware on this device recently, I get this:
Unable to activate Windows We can’t find any devices linked to your Microsoft account that can be used for reactivating the device you’re using right now. Make sure you’re signed in with the same Microsoft account you linked to the Windows 10 digital license on this device or try again later. See other devices linked to your Microsoft account
When I click See other devices linked to your Microsoft account, the list is empty and I see:
We can’t reactivate Windows from these devices.
When I try Activate by phone, in the Select your country or region section Poland is missing. It looks like a bug – after letter P there are only 2 countries listed, and many others (e.g., starting with T and later) are missing. I’m attaching a screenshot of this issue.
I also ran in Command Prompt: slmgr -dli
I’m attaching a screenshot with the result.
Please help me solve this problem.
1
Where did you get your Windows licence was that pre-installed on the PC or did you purchase a full retail Windows licence from Microsoft or from a 3rd party retailer?
Or is your Windows licence based on a previous Windows 7 or 8 licence?
2
Download the free ShowKeyPlus app from the Microsoft Store.
Please provide a screenshot of that app window and please hide your product key in the screenshot.
I purchased "Windows 11 Home (pobierz)" from its own/official website.
It's not based on a previous Windows.
Thank you for that information, in that case, because you are unable to use the troubleshoot method to move the licence to your new hardware, you will need to contact Microsoft support directly, they will be able to see the licence on your account and move that licence for you, they are the only ones with account access.
How can i contact? I live in Poland and can't find Polish phone number. I asked for "Service requests" 8/10/2025 but nobody called yet.
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Looks like your Windows 11 license key isn’t linked to your Microsoft account and is still tied to your old hardware. Ask the seller for a replacement, it’s the quickest way to avoid headaches and wasted time.
