Will Not Be Addressed
The development team has considered the issue or request and concluded it will not be addressed. The issue's Additional Information section may contain further explanation.
Additional Information
No Public Explanation
Workaround
1) Create a TIN from the 'SurfaceLines' feature class utilizing the 3D Analyst > TIN Management > Create TIN tool.2) Run the TIN Triangle tool from 3D analyst > From TIN > TIN Triangle.The end result is a TIN and a 3D polygon emulating the surface.