If the tool name contains an underscore in a Python toolbox, the analyzer returns the error that the tool is unsupported when publishing to ArcGIS for Server 10.3
Last Published: February 26, 2015ArcGIS for Server
Bug ID Number
February 24, 2015
July 28, 2020
ArcGIS for Server
Operating System Version
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.