using Serialize fails but the Newtonsoft version works

[Greypuma]

I was trying to serialize an object into json. I get an empty string. below is the code i used.
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.Json;
using System.Text.Json.Serialization;
using Newtonsoft.Json;

namespace test
{
public class AdbEmulator
{
//needs to be public otherwise wont work
public string name;
internal string attached;

}
public class AndroidJson
{
    public AndroidJson()
    {
        AddData();
    }
    public void AddData()
    {
        AdbEmulator adb1 = new AdbEmulator() { name = "emulator-5554", attached = "ll" };
        emulators.Add(adb1);
        string jsonAdb = System.Text.Json.JsonSerializer.Serialize<AdbEmulator>(adb1);
        string newtonjson = Newtonsoft.Json.JsonConvert.SerializeObject(adb1);
    }
}

Program.cs
static void Main(string[] args)
{ AndroidJson aj = new AndroidJson(); }

Output
jsonAdb = {}
newtonjson ={"name":"emulator-5554"}

I'm not sure why newtonsoft works and the microsoft one does not.
i'v'e tried the code in an dotnet core 3.1 project and windows application ( including the nuget package for that project).

[GalaxiaGuy]

Serializing fields is not yet supported:
#876

[ahsonkhan]

@Greypuma, if you turn your fields into properties it should work as expected. Please re-open if you still see issues.

Thanks.

using System.Text.Json;
using System.Text.Json.Serialization;

namespace test
{
    public class AdbEmulator
    {
        //needs to be public otherwise wont work
        public string name {get; set;}
        internal string attached;
    }
}