Why has Windows 11 Pro (version 23H2) deactivated after update?

[Windows Server]

Hi, I purchased the parts for a new computer in March, including a full version (23H2) of Microsoft Windows 11 Pro 64bit (1 PK DSP OEI DVD). I built the computer and installed Windows successfully, activating it back in March. However, after the recent update this week, my version has deactivated itself, and will not let me reactivate it - this 9 months of successful usage. Please advise.Information:Edition Windows 11 ProVersion 24H2Installed on ‎12/‎18/‎2024OS build 26100.2605Experience Windows Feature Experience Pack 1000.26100.36.0

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