Windows 11 Pro saying it's not activated even though I bought it six months ago with it included

[Laurence Mon.]

Hi! Ever since yesterday, my computer's been telling me to go activate Windows. I bought my computer (PC) six months ago and it came with Windows pre-installed. When I go to settings, as prompted, this is the message I get. When I troubleshoot, it gets me nowhere. I called the shop I got the computer from and they're telling me they can fix it but only if I bring in the computer (it's a heavy PC), which seems weird. Is there anything I can do? Does someone knows why this is suddenly happening?Thanks!

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