Server Operating System 21h2 Vs 22h2
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Another Microsoft employee @ariaupdated reached out and said it was an update for the Azure Stack HCI, which is updated once a year and applies to virtual machines in the Azure Cloud. This update is not available for on-premises servers. I pointed out that this was confusing – and she now wants to have this described more clearly by the people responsible …
 Sources: 
 - https://learn.microsoft.com/en-us/windows/release-health/windows-server-release-info
 - https://www.deploymentresearch.com/products-for-software-updates-demystified/