Trying to capture the Digicert Automation API with a Refit HttpClient Factory.

When my interface method is declared to return a string
Task<string> GetAgentList([Body] GetAgentListReq req);
I can see from the string returned that I’m getting the expected JSON result from the API. In particular the data member is returning an agentList member with a JSON array of agents.

When I change the interface method to return the defined result class
Task<AgentList> GetAgentList([Body] GetAgentListReq req);
The deserialization happens without throwing an exception, but the data member is null.

Here’s my interface and classes:

using Refit;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Digicert.Automation.API.Client
{
    [Headers("X-DC-DEVKEY: redacted")]
    public interface IDigicertAutomation
    {


        [Post("/agent/basicdetails")]
        Task<ApiResponse<IEnumerable<AgentSummary>>> GetAgentSummary(AgentSummaryReq req);

        [Post("/agent/list")]
        //Task<string> GetAgentList([Body] GetAgentListReq req);
        Task<AgentList> GetAgentList([Body] GetAgentListReq req);
    }



    public class AgentSummaryReq
    {
        public required string licensekey { get; set; }
        public int accountId { get; set; }
        public int divisionId { get; set; }
    }


    public class GetAgentListReq
    {
        public int accountId { get; set; }
        public class Criterion
        {
            public required string key;
            public required string operation;
            public required List<string> value;
        }
        public required Criterion[] searchCriteriaList { get; set; }
        public required int[] divisionIds { get; set; }
        public int startIndex;
        public int pageSize;
        public required Dictionary<string, string> sorting { get; set; }
    }

    public class Error
    {
        public required string message { get; set; }
        public required List<string> detailedMessage { get; set; }
        public required string errorCode { get; set; }
    }

    public class AgentSummary
    {
        public required Error error { get; set; }
        public class Data
        {
            public required string licenseKey { get; set; }
            public required string agentName { get; set; }
            public int updatePreference { get; set; }
            public required string stateString { get; set; }
            public required string agentVersion { get; set; }
            public bool updateAvailable { get; set; }
            public bool publishUpgradeOption { get; set; }
            public required string emailAddresses { get; set; }
        }
        public required Data data { get; set; }
    }
    public class AgentList
    {
        public required string error { get; set; }
        public class AgentListdata
        {
            public required List<AgentInfo> agentList;
        } 
        public required AgentListdata data {get;set;}
    }

    public class AgentInfo
    {

        public int agentId { get; set; }
        public required string accountId { get; set; }
        public required string divisionId { get; set; }
        public required string hostname { get; set; }
        public required string agentName { get; set; }
        public required string status { get; set; }
        public required string sensorName { get; set; }
        public required string type { get; set; }
        public required string agentLicense { get; set; }
        public int updatePreference { get; set; }
        public bool updateAvailable { get; set; }

    }
}

And my console app calling the API:

using Microsoft.Extensions.Hosting;
using Refit;
using Digicert.Automation.API;
using Microsoft.Extensions.DependencyInjection;
using Digicert.Automation.API.Client;
using static Digicert.Automation.API.Client.GetAgentListReq;
using System.Diagnostics;

namespace ConsoleApp1
{
    internal class Program
    {
        static async Task Main(string[] args)
        {
            using IHost host = Host.CreateDefaultBuilder(args)
                .ConfigureServices((_, services) =>
                {
                    services
                    .AddRefitClient<IDigicertAutomation>()
                    .ConfigureHttpClient(c => c.BaseAddress = new Uri("https://caas.digicert.com/automationws/v1/"));
                }).Build();

            var automationClient = host.Services.GetRequiredService<IDigicertAutomation>();

            var sorting = new Dictionary<string, string>
            {
                { "AGENTNAME", "ASC" },
            };
            var req = new GetAgentListReq() { accountId = 1349264, searchCriteriaList = Array.Empty<Criterion>(), divisionIds = Array.Empty<int>(), startIndex = 0, pageSize = 50, sorting = sorting };


            var results = await automationClient.GetAgentList(req);
            //var result = results.Content;
            //var x = results.RequestMessage?.Content;
            
            //if (result?.data != null && result?.data.agentList != null)
            //{
            //    foreach (var a in result.data.agentList)
            //    {
            //        Console.Out.WriteLine(a.agentName);
            //    }
            //}
        }
    }
}