Hence the underlying server is a Windows 2016 .Net is installed in version 4.6; also the Message Queuing service is running - but during SnapCenter install there was a pop up, warning that there is an outstanding reboot (although I just reboote beforehand!) and that install of message queuing could fail - but it went away without intervention and installation finished without complains.
Going from job monitor to view logs revealed only the aformentioned line ...
my theory is at the moment:
because the first attempt of install the plugin failed, I tried to re-install by "modify" the host (that is: SnapCenter host).
In the summary I get the following then:
pay attention to "Plug-ins: none, Version: none" - maybe the wizard does not select anything to install ...
in contrast the picture when adding the host:
Both, version and plugin are mentioned ...
Anyway - I removed the host and re-added it, filling out all the fields of the wizard.
Now the plug-in installation failes complaining about an "incorrect parameter" in the job details:
But the log itself does not give a clue to me which parameter is wrong ...
Manual installa is more "difficult" because you must manually open the link to register the Plug-in for VMware vSphere with vCenter after the installation is completed
Navigate to C:\ProgramData\NetApp\SnapCenter\PackageRepository, copy the snapcenter_windows_host_plugin file , and then paste the file on the local host where you want the Plug-in for VMware vSphere to be installed.
The SnapCenter Plug-ins Package for Windows includes the Plug-in for VMware vSphere.
From a Windows command prompt on the local host, navigate to the directory where you pasted the snapcenter_windows_host_plugin file.
starte the installation .exe file (ISFeatureInstall=SCV)
Manual install worked smothly - now I can proceed.
Thanks for your support.
PS: one could say "typically not reading the docs" - but how fair is it on the other hand to proclaim "NOW it is possible to have SVC on the SnapCenter Server! Hurrayh!" and in the fine-print "... but not the default way by means of the Web-GUI"?