I wonder if this question would be better suited for Schneider Electric since they develop that extension.
Another thought is that you may need to have your network with ArcFM data in the map before the tools are activated. That is how it is with other tools bars.
The UN features do not need to be in the map for Editor to work.
If editor is installed correctly, the log in window for SE will appear at all points when ArcGIS Pro is installed.
Review if the installation actually occurred because it does not appear that is the case.