Microsoft has released a new preview build of Windows Server 2022 to Windows insiders

Windows Server Preview Build 20303

A new build of the Windows Server Long-Term Servicing Channel (LTSC) Preview that contains both the Desktop Experience and Server Core installation options for Datacenter and Standard editions is available.

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How to Download 

Registered Insiders may navigate directly to the  Windows Server Insider Preview download page.  If you have not yet registered as an Insider, see  GETTING STARTED WITH SERVER on the  Windows Insiders for Business portal.

Windows Server Insiders - Microsoft Tech Community