A new Motherboard hardware problem

[Microsoft Windows]

Hello, I have a problem. I can't use my Windows 10 Pro key, which I had used once before, on my new motherboard. I upgraded from Windows 10 Pro to Windows 11 before changing my motherboard, and now I have a new motherboard. I still have the key, but when I enter it, it says it couldn't be activated. Is this because I am on Windows 11, because my old motherboard is still linked to my account, or because my key has become unusable? I don't have the money to buy a new Windows, so I want to use my existing Windows again. Is there a solution to this?

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