Unable to activate Windows 10 with error 0xc004f210

I am trying to activate Windows Home Single Language 10 (latest build 10586) using a Windows 8.1 Single Language Product Key.

But it's saying:

You are running Windows 10 Home Single Language. The Product key you entered cannot be used to activate this edition.
Error Code: 0xc004f210

I extracted the product key from the BIOS using the ProduKey utility when I was running Windows 8.1.

Here is a link to an article reporting that it's now possible to activate Windows with a previous Windows product key (from Windows 7 or later):

http://download.cnet.com/blog/download-blog/activate-windows-10-with-a-previous-windows-product-key/

I chatted with Microsoft Technical support; they said:

Ryan P
Basically "If you install this build of the Windows 10 Insider Preview on a PC and it doesn’t automatically activate, you can enter the product key from Windows 7, Windows 8 or Windows 8.1 used to activate the prior Windows version on the same device to activate Windows 10" meant the product key will not activate Windows because it is not a unique product key and is therefore blocked at the activation servers just like OEM keys are to prevent piracy. The free Windows 10 does not activate by key. It is an entitlement activation. Here is Microsoft's explanation.

I am not able to understand what exactly they meant.

As mentioned in comment/answers I tried clean install hoping it would automatically detect the key and proceed. Instead it requested a product key. And on manually entering the product key, it gives this error:

In case the image not clear it says:

The product key entered does not match any of the Windows images available for installation. Enter a different product key.

Pre Fall Update: You can't activate a fresh Win 10 install using a Win7/8 key. You'll have to install Win8 back to your computer and then update using Windows Update or run Setup from installation media while you're logged on Windows 8.

Post Fall Update: You can use a Win7/8 license key for a fresh Win10 install as long as the key was already used on the same machine before. Thanks to Tetsujin for pointing that out.

What a pain, had the same 0xc004f210 error, using MediaCreationTool.exe I picked 'Windows 10 Home Single Language' thinking it would be more compact.

While the ISO worked fine for a clean install on a computer with the key in the BIOS ( Windows 8 sticker ) it failed for a Windows 7 Home Premium license. Note the Windows 7 computer had already been upgraded to Windows 10 and was successfully activated, but a clean install failed to activate.

The solution was to use MediaCreationTool again and this time pick 'Windows 10' for the ISO then during the install pick 'Home' and 'I don't have a key'.

Ok, I also faced the same problem, with my Canvas Laptab, this is how I solved it.

First make sure the version of windows you are downloading is the exact version of the Windows 8.1 including the language, mine was English(US), I downloaded English(UK) leading to lots of hair shedding rectifying the mistake,so please make sure you got the version right.

Don't clean install the first time try to do an upgrade from the ISO, now even if you did upgrade they will ask you a product key, enter the generic key 7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH then install. I have never seen the skip option here in Windows 10 Home Single Language anyway if your device encryption is on,turn it off by going in settings via the notification centre and clicking on System then About.

After installation your device will not be activated and will get error code 0x8007007B(The filename,directory name, or volume label syntax is incorrect)

Then, change the product key to another generic key BT79Q-G7N6G-PGBYW-4YWX6-6F4BT, your device will seem like its activating but you will get error code 0x803F7001 stating the digital license was not licensed to the device,which is true as the device was never activated with that product key.

Now change the product key again with the product key of your earlier activated Windows 8.1 Key that you used in the device, and viola its activated, that's how I activated mine. No use calling Microsoft Help, they give you a diverse elaborate crazy explanation that helps no one

I hope you can activate your windows, mine was a 8.1 product key oem provided that I copied down from command prompt(wmic path softwarelicensingservice get OA3xOriginalProductKey).

I did upgrade from ISO both windows 10 update and November update the activation only occurred after the November update and in that flow of event only, I wasted countless hrs talking to Microsoft support they even made me call up the OEM of my device Micromax,it was all of no use.

Really hope this works for you, upgraded Windows 8.1 Single Language(English US) to Windows 10 Home Single Language (English US) and activated with Windows 8.1 Single Language product key.