Windows 10: Accidentally put a newly purchased product key on my already activated windows 10

Hello,Assume I have PC A and PC B... PC A is already activated via digital license linked through my Microsoft Account, PC B is not activated at all.I purchased a Product Key which I intended to use on my PC B, but I accidentally did it on the other one already activated instead PC A, basically what I did was, I went to: Update Product Key and put there my newly bought product key, the window closed itself after ~2 seconds after inputting the product key. On PC A it still says it's activated with a digital licenseI tried using the Product Key which I've recently bought on PC B and the produc

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Windows 10 product keys and activation - and the KMS angle

Changing the product key to the generic Windows 10 product key will reset activation to the standard retail channel for activation. It might just activate (if there was a previous digital license for Windows 10 for that computer established with Microsoft). Once Windows 10 is back on the retail activation channel, then more than likely changing the product key to the Windows 8 product key using the same method may work.

 

Windows 10 Product Key for a Free Upgrade

Hi,

The product key is important to activate and install Windows 10 to your device. Regarding your concern, let's try to isolate the issue and see what's causing you unable to use the product key to activate and install your Windows 10. Kindly provide the following
information:

• Where did you purchase the product?
• What is the error message you received after entering your product key?
• What troubleshooting steps have you tried?

 

Windows 10 Prod key shows different

I have installed windows 10 pro on newly installed pc, I purchased a key while back i used an app called prodkey to find what the prod key is so i could use the same key for new pc. however when i activate with key that i bought Prod key reports it as a different key all together *Confused I guess im little confused on this as well with how it handles License keys like it is activated but not - lot different than Win7. Does windows 10 actually require a key after a fresh install, the step where it asks to put in product key I skipped that step as i would do it later but when i go to System in control panel it says Windows is activated huh? so i selected change product key and put in the key i purchased not sure why the app prod key shows a totally different prod key from C:\windows.