What happened to my Product Key's validity?

[Windows 11]

Hello Microsoft! It has been many years but I finally decided to upgrade my PC from it's initial build. The problem is that when I upgraded the motherboard, it just so happened to be faulty. Even worse is that I transferred my product key over to that motherboard to activate Windows. Well long story short I had to refund that board and get it sent back and ordered another one. Here's the kicker. Now my Windows product key that I have been using for the better part of 7 years is now invalid? It was just working on the now defunct motherboard and now it will not work on my new-new motherboard. I

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