我有这个端点方法：

var authToken = await [url]
                    .AddAuthHeaders(config)
                    .PostJsonAsync(new AuthTokenRequest
                    {
                        GrantType = "test",
                        ClientId = "test",
                        ClientSecret = "test",
                        Audience = "test"
                    })
                    .ReceiveJson<AuthTokenResponse>();

它调用这个端点：

[HttpPost]
public IActionResult Get([FromBody] object request)
{
    try
    {
        var tokenDescriptor = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(new[]
                {
                    new Claim(ClaimTypes.Name, "test")
                }),
                Issuer = _issuer,
                Audience = _audience,
                SigningCredentials = new SigningCredentials(
                    new SymmetricSecurityKey(Encoding.ASCII.GetBytes(_key)),
                    SecurityAlgorithms.HmacSha512Signature)
            };

        var tokenHandler = new JwtSecurityTokenHandler();
        var token = tokenHandler.CreateToken(tokenDescriptor);

        // Create a new instance of the AuthTokenResponse class and set its properties
        var response = new AuthTokenResponse
            {
                AccessToken = tokenHandler.WriteToken(token).ToString(),
                TokenType = "Bearer",
                ExpiresSeconds = token.ValidTo.Subtract(token.ValidFrom).TotalSeconds.ToString(),
                AuthTokenType = AuthTokenType.Generic
            };

        return Ok(response);
    }
    catch (Exception ex)
    {
        _logger.LogError(ex, "Error generating token for request {Request}", request);
        return BadRequest();
    }
}

我的AuthTokenReponse类是：

[DataContract]
public class AuthTokenResponse
{
    [DataMember(Name = "access_token")]
    public string AccessToken { get; set; }

    [DataMember(Name = "token_type")]
    public string TokenType { get; set; }

    [DataMember(Name = "expires_in")]
    public string ExpiresSeconds { get; set; }

    public AuthTokenType AuthTokenType { get; set; }
}

public enum AuthTokenType
{
    Generic,
    Custom
}

现在，当我使用post方法调用端点时，它会按预期到达终点，并且我可以看到响应对象生成了所有正确的属性。它生成一个令牌，我可以清楚地看到，并返回一个有效的响应对象。
然而，接收对象的应用程序接收到：

AccessToken null
                TokenType null
                ExpiresSeconds null
                AuthTokenType Generic

除了AuthTokenType有正确的值外，其他都是null。
当我使用postman我得到正确的值

{
    "accessToken": "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJ1bmlxdWVfbmFtZSI6Indob2NhcmVzaXRzZmFrZSIsIm5iZiI6MTY4MzMxNDAxMiwiZXhwIjoxNjgzMzE3NjEyLCJpYXQiOjE2ODMzMTQwMTIsImlzcyI6Imh0dHBzOi8vbG9jYWxob3N0OjUwODg5LyIsImF1ZCI6Imh0dHBzOi8vbG9jYWxob3N0OjUwODg5LyJ9.W_qvEBeF4gGMYAKA6n09bYPWsKrWvpEwRc0b7DdZuNJf4RDU25yh3GUv5Ht0UupoBqGYHDBfBjR8O21sv-56rg",
    "tokenType": "Bearer",
    "expiresSeconds": "3600",
    "authTokenType": 0
}

我不明白为什么会这样？是因为对象没有序列化它的属性吗？有什么想法吗