Cannot use IOptions in console app .NET Core

I have a console application where I am building up the configuration

IConfiguration config = new ConfigurationBuilder()   .AddJsonFile("appsettings.json", true, true)   .Build();var services = new ServiceCollection();services.AddOptions();services.Configure<ResourceConfiguration>(config.GetSection("ResourceConfiguration"));

This doesnt work

  Error CS1503: Argument 2: cannot convert from 'Microsoft.Extensions.Configuration.IConfigurationSection' to 'System.Action<ResourceConfiguration>' (29, 55)

I have the following in my using (as well as my own namespaces)

using Microsoft.Extensions.Configuration;using Microsoft.Extensions.DependencyInjection;using System;using System.IO;

IConfiguration config = new ConfigurationBuilder()   .AddJsonFile("appsettings.json", true, true)   .Build();

Returns IConfigurationRoot which may be the issue?

What am I doing wrong?

This is .NET Core 3.1

Paul