Hardware upgrade and windows 11 upgrade wont activate

[Windows Server]

I had a computer with an activated windows 10 running on it. It wasn't eligible for a windows 11 update because the hardware was too old. I bought a new motherboard, cpu and memory. Installed it and updated to windows 11. Now it won't activate and I don't have the product key. Which would have been from a really old version of Windows.

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