Windows Admin Center do not notice changes from connected Windows Servers
Once added, Windows Admin Center 1804 do not notice changes from added Windows Servers, like expanding RAM in a virtual mashine.
You have to remove and readd the Windows Server from WAC to get the correct configuration.
Windows Admin Center should realize "Hardware"-changes as soon as possible.
With changes I mean adding or removing Hardware like vCPU or RAM inside a virtual mashine...