Why cant I activate Windows 11 Pro?

[Windows 11]

A while back, I bought a Windows 10 Pro key. It has worked on all of my devices and has worked in the past when I upgraded to Windows 11, but recently, whenever I try to use the key on Windows 11, it does not work. I also tried using the key and then upgrading to Windows 11, but that won't activate either. The key is valid; I made sure of that. Please help. Thank you.

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