I have a C# project in vs2010 that generates a XML documentation file, where I have set the output path of the generated file to the project output path.
My problem is t
I faced this exact problem and I couldn't figure it out for the life of me.
It turned out that I had a old version of the .xml file in a folder where I saved dlls used in the project. So visual studio was just copying that xml file instead of generating a new one. (This was on Visual Studio Communtiy 2017)
So check if you have a old version of the .xml file in any of the same directories as any of your referenced dlls.