I cant find my product key for windows 11.

[Microsoft Windows]

I bought windows 11 in store and set it up on my computer. Since then i had a hardware change and i cant reactivate my windows. I dont have the box anymore with the product key, just the USB. When i troubleshoot i get error code 0xC004F012. I have no email from windows with a product key. Just a welcome to windows email. And nothing on my microsoft account says i have or had windows 11. What do i do? Will i have to buy windows all over again?

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