Windows 11 pro suddenly doesn't see activation key

[Microsoft Windows]

(sorry for bad english)I bought a pc with Win11Pro from a trustworthy company 2 years ago. I used the key included to activate the system and everything worked perfectly fine for these 2 years. Today while playing a game suddenly a watermark saying "Activate windows" appeard (if it matters I was playing League of Legends). Again, it was activated and worked for 2 years. Worth noting that no parts were added/replaced (the machine was never even opened) and I have not played around with risky settings (I have barely ever opened the terminal and probalby never touched the register and such on th

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