Why isn't my Windows product key not working despite it having worked before?

O

OliverPlagata

I received my brother's old computer and have installed new parts on it. I installed Windows 10 Home with a product key and it didn't come up with any errors. I suddenly got a notification that I have to activate Windows. I tried to through the Microsoft store, but it said it wasn't valid. The reason I'm almost certain it's valid is because it is the product key that was shown when scanning my brother's computer with Belarc Advisor. I copied the product key exactly and it still didn't work. Can someone explain please? Thanks in advance.

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