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Product key changed after upgraded to windows 10

I'm using my laptop Asus N56VZ which comes with a Windows 8 Home Single Language product key (***-2RYQ3) in its bios, everything is normal, I recieve update frequently (but I didn't upgrade to windows 8.1).
Yesterday, I upgraded my laptop directly to Windows 10 (skip Windows 8.1) through Media Creation Tool (x64)
(https://www.microsoft.com/en-us/software-download/windows10)
It didn't require me to insert the key, but after I finished installing Windows 10, I realized that the product key had been changed to BT79Q-G7N6G-PGBYW-4YWX6-6F4BT which is being shared on the internet.
My windows 8 key didn't work on windows 10 but when I rolled back to windows 8, it still works.
So what BT79Q-G7N6G-PGBYW-4YWX6-6F4BT is? Why did it automatically insert to my computer? 
What's wrong about my key?

P/s: I'm not native English speaker so, I'm sorry if I wrote something wrong.

Hi Gen,

Microsoft has not released any product key for Windows 10. The key which you are referring to is a generic key which is usually seen when we skip the activation process or we do a key less installation. The activation for upgrade installation works this way, if you upgrade from an already activated Windows 8.1 or Windows 7 SP 1 PC  your PC's activation will carry forward which means it will be in an activated state after the upgrade to Windows 10. If you perform a clean install of Windows 10 you have to purchase a product key or you can go back to Windows 8, upgrade to Windows 8.1 install the required updates and you can upgrade to Windows 10.

http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/frequently-asked-questions-windows-10/5c0b9368-a9e8-4238-b1e4-45f4b7ed2fb9

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I didn't upgrade from an already activated Windows 8.1 but I upgraded from an already activated windows 8 using Media Creation Tool. And when I did that, MCT didn't ask me for Product key. Is that ok?

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I've tried to upgrade to windows 10 from windows 8.1 using Windows Update.
It's exactly the same, the product key changed to BT79Q-G7N6G-PGBYW-4YWX6-6F4BT
When I type slmgr.vbs /dli in CMD, it says my windows is Retail, I think it should be OEM like in Windows 8.1.

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Hi,
I have just upgraded my laptop to Windows 10 from my windows 8.1 which was genuine [pre-loaded with lap] but now unable to activate windows showing the following error.
Please help in the activation of free windows.

Showing same product key  as mentioned here in the forum.

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Did you try the key  BT79Q-G7N6G-PGBYW-4YWX6-6F4BT ?

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Last updated April 25, 2024 Views 6,758 Applies to: