I am not sure if this is by design or not (the getting started and sample MVC application appear to suggest that it might not be), but when attempting to get one of my existing MVC projects ported over from a different dependency injection service to instead use this one, I was unable to get controllers to work with dependency injection unless I had added the controllers as services themselves. It appears this is due to the Mvc package having no path to ActivatorUtilities.CreateInstance (or, in this case, ActivatorUtilities.CreateFactory). It is only called by RequiredObjectFactoryFactory, which itself is only used when calling GetRequiredService, where Mvc only calls TryGetService.