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I'm using 2017

a few people in the GDQ discord suggested it, but try making sure VS is set as the default IDE for Unity.  The instructions for doing it are on this page https://docs.unity3d.com/Manual/VisualStudioIntegration.html

So I took a look, and Visual Studio was set as the default IDE however generating csprog files was unticked. I've ticked that now, so hopefully that helps.