@metalhead - Thanks for sharing the link. Started the download. Going well. Can't wait to complete and start rebuilding lab with 2019 products (Server, Exchange, Skype. SP & Office).
I just installed server 2019. No issue with activation. Server not joined to the domain yet. Activation successful through KMS server. Testing Win 10 1809 deployment through SCCM Servicing plan. Will update the post later. Update: The upgrade of Win 10 1803 to Win 10 1809 went without any issue. If anybody need complete document, I can provide. Just PM. I am unable to upload the file during to its size.
It does return normal message: "Windows(R), ServerStandard edition: Volume activation will expire 5/13/2019 5:14:01 AM", that means what activation is fine. It's just cosmetic bug. But I have no idea why it appears on Domain Controllers only.