I have a Windows Key for Windows 10 Home Single Language, but my new computer came with a non activated Windows 10 Pro. How can I use my key?

[Windows 10]

As the question states, I already have a key, but when I try to activate it on my configurations, I get an error as if it doesnt work (0xc004f050).After trying the key again on my old computer, I realized the key IS working, but not on the new one, and I believe it is because of it coming from the shop with Windows 10 Pro. Is there any way for me to rollback?

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