Windows 11 Pro no longer activated on custom PC

On March 24, I had Microcenter build me a PC and install and activate Windows 11 Pro on it. I was never given a Windows 11 CD/DVD at the store.

Just now, after installing the 24H2 update, Windows is no longer activated. I am subscribed to Priority Care+, if that is relevant. Is there a way for me to find what my product key was so I can reactivate?

Thank you.

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