So, the issue is that the installer is missing dependencies when attempting to install on our dev server. The installer, after building fine for one deployment, now won't build without making changes to it... Which includes deleting files from the installer that it's looking for. I believe the installer wants a SqlClient DLL, and after removing it the installer works, but the exe won't run. Complains it's missing EntityFramework, which we don't use unless it's a dependency of a dependency.
So it builds, but the resulting installer is missing dlls.
Or... It doesn't build, if we don't make any changes, because it's looking for netstandard2.0 folder but the dependency is in a different folder.
Screenshot 1: https://i.imgur.com/XN1CEEv.png
Actual location of dependency: https://i.imgur.com/PaTxk9i.png