Windows 11 requires Activation but I can't find product key as it was supplied with a DVD from a retailer

[Windows 11]

Hi,After a Windows update at the start of March Windows is showing as requiring Activation. But, it's been more than a year since Windows was installed and I am unable to locate the Windows product key that came with the DVD. Have tried running the cmd "wmic path softwareLicensingService get OA3xOriginalProductKey"No path is found.Running the troubleshoot wizard comes up with:We weren't able to activate Windows on this device.Tried using the backup key in the Registry under Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatformIt came up with We can

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