Product Key no longer working after upgrading to Windows 11

[Windows 11]

I recently upgraded my PC and previously my motherboard did not support Windows 11. Now with the new system I am able to upgrade to Windows 11, however since i performed the upgrade my product Key no longer works and I have the watermark on the bottom right of my screen prompting to "Activate Windows". Is there any way to have my product key work again or do i need Microsoft to supply a new one?

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