Thank you for your feedback. Via my search, you can deploy it on Windows server 2019 by some configurations. Here are some hints for you.
Validate Active Directory prerequisites
Planning an adequate number of Windows Server 2016 or later Domain Controllers for Windows Hello for Business deployments
If you are planning to use Windows Server 2019 domain controllers refer to KB4487044 to fix this issue.https://support.microsoft.com/en-us/help/4487044/windows-10-update-kb4487044
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