When I try to create a duplicate in the CRM web application I am getting a pop-up indicating that I am trying to create a duplicate record. However, if the create using Web API (C#) from a .Net application then by default, the duplicate record is getting created without any warning.
Here is the sample code we are using to using to create a record using Web API
JObject accountRecord = new JObject();
accountRecord.Add("name", "JKC");
accountRecord.Add("accountnumber", "00112233");
HttpRequestMessage createAccountReq =
new HttpRequestMessage(HttpMethod.Post, getVersionedWebAPIPath() + "accounts");
createAccountReq.Content = new StringContent(accountRecord.ToString(),
Encoding.UTF8, "application/json");
HttpResponseMessage createAccountRes =
await httpClient.SendAsync(createAccountReq);