why am i not able to install a new retail key

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okay so i am unable to install my windows pro retail key from my old computer to my new one even though it is transferable. Whenever i uninstall and clear the key from my old computer it still displays that its activated using the key even if i disconnect it from a Microsoft account. I've tried multiple tutorials and videos on how to fix this but it still doesn't work. I know that its a retail key so why am i not able to un-activate it. I am able to un-activate the home retail key on my new computer and it displays that I'm un-activated but on the old pc the pro key still displays that its bei

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