My old motherboard and hard drive died, how can I activate windows on my new system using my old account?

[Phlippr]

So I had a machine with windows 10 activated, genuine copy of windows. But that machine died and I had to start fresh on the motherboard and hard drive. This means I am not able to go back into my old system to find my product activation key. Is there an activation key that was attached to my microsoft account somewhere? Or can I get a replacement key somehow? please help!

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