ASP.NET Core HttpClient POST call to okta user api failed


I am working on a project with OKTA users/groups api. I am trying to add/edit user/group in OKTA user management through .NET Core httpclient calls. But it failed in all user/user data, and gives error message “The request body was not well-formed.” always even when i have proper data.

Here is the code i am using.

var uri = “”;
using (var client = new HttpClient())
var request = new HttpRequestMessage
Method = HttpMethod.Post,
RequestUri = new Uri(uri)
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(“application/json”));
request.Headers.Authorization = new AuthenticationHeaderValue(“SSWS”, “”);
request.Content = new StringContent(JsonConvert.SerializeObject(data), Encoding.UTF8, “application/json”);
var response = await client.SendAsync(request);
var result = response.Content.ReadAsStringAsync().Result;
return JsonConvert.DeserializeObject(result);

data: {“Id”:null,“Status”:null,“Profile”:{“FirstName”:“demo”,“LastName”:“user”,“Email”:“”,“Login”:“”,“MobilePhone”:“1111111111”,“Department”:“Art”}}

OKTA Error: {“errorCode”:“E0000003”,“errorSummary”:“The request body was not well-formed.”,“errorLink”:“E0000003”,“errorId”:“oae2ca8eNAcRr6ahe4kgifAzg”,“errorCauses”:[]}

The same request is working fine in POSTMAN, its wired and surprise.

Someone can check this and give me a solution.


Hi @Pandi

Can you please open a support ticket with us at in order to have this further investigated?

Thanks, @dragos. I found a solution for the reported problem. Serialize the payload using CamelCaseProperty resolver fixes the issue.

JsonConvert.SerializeObject(payload, new JsonSerializerSettings
ContractResolver = new CamelCasePropertyNamesContractResolver(),