Action delegate not configuring mvc in ConfigureServices

I've started learning asp.net core and trying to improve my c# knowledge.

I'm struggling with ConfigureServices in my startup class.

    public void ConfigureMvcOptions(MvcOptions options)
    {
        options.EnableEndpointRouting = false;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        Action<MvcOptions> options = new Action<MvcOptions>(ConfigureMvcOptions);
        services.AddMvc(options);
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseStaticFiles();
        app.UseMvcWithDefaultRoute();

        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello world");
        });
    }

This above is resulting in a compile error

"Warning MVC1005 Using 'UseMvcWithDefaultRoute' to configure MVC is not supported while using Endpoint Routing. To continue using 'UseMvcWithDefaultRoute', please set 'MvcOptions.EnableEndpointRouting = false' inside 'ConfigureServices'"

I can remove the error by using a Lambda expression inside the AddMvc method instead but I don't understand why this is working

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc((options) => options.EnableEndPointRouting = false);
}

The above works without a problem. I just don't understand what's wrong with my implementation of the Action delegate?