Unale to access WCF service from azure functions?

Getting exception while accessing WCF SOAP service from Azure fuctions using dotnet core.

Error Message:

The content type multipart/related; type="application/xop+xml"; start="<http://tempuri.org/0>"; boundary="uuid:06e7725d-7c4a-404d-9f6b-0d9044ec44fe+id=2"; start-info="text/xml" of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 872 bytes of the response were: '
--uuid:06e7725d-7c4a-404d-9f6b-0d9044ec44fe+id=2
Content-ID: <http://tempuri.org/0>
Content-Transfer-Encoding: 8bit
Content-Type: application/xop+xml;charset=utf-8;type="text/xml"

WCF Calling Methods in azure functions:

 public async Task<IActionResult> PosteCaseAsync([HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequest httpRequest)
        {
            MethodBase methodBase = MethodBase.GetCurrentMethod();
            CaseListResponse response;
            try
            {
                string request = await httpRequest.ReadAsStringAsync();
                await _httpClient.LogAsync(LogTypes.Info, methodBase.ReflectedType.Namespace, methodBase.ReflectedType.Name, "PosteCaseAsync" + request).ConfigureAwait(true);
                CaseListUpdateRequest caseRequest = JsonConvert.DeserializeObject<CaseListUpdateRequest>(request);
                CaseServiceClient caseService = new CaseServiceClient();

                response = await caseService.UpdateCaseAsync(caseRequest);
                return new ContentResult { Content = response.ToString(), ContentType = Environment.GetEnvironmentVariable("XmlContentType"), StatusCode = HttpStatusCode.OK.GetHashCode() };
            }
            catch (Exception ex)
            {
                return new ContentResult { Content = ex.Message, ContentType = Environment.GetEnvironmentVariable("XmlContentType"), StatusCode = HttpStatusCode.OK.GetHashCode() };
                //await _httpClient.LogAsync(LogTypes.Info, methodBase.ReflectedType.Namespace, methodBase.ReflectedType.Name, "Exception: " + ex.Message).ConfigureAwait(true);
                //throw ex;
            }
        }