Curve Piping disabled?

I want to apply curve piping (not the command but as property of a curve to display in render view). When I select a curve and open Properties, the curve piping option is not shown.
Alternatively, when I used the _CurvePiping command the command line returns “Unknown command:_CurvePiping”.

Did something go awry with the command itself?
I tried several different lines (line, polyline, curve) and restarting software and computer to the same result.

Do you have some disabled plugins?

Make sure the Displacement plug-in is enabled and loaded.

Any luck?