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WCF provider does not work after calling external API

I have a web API API method that calls an external REST API service using HttpClient. The results of an external REST call are then passed to the WCF service through a call to its proxy.

If I first call the WCF proxy and then call the external REST service, everything works as expected. If I reverse the order of the calls, the WCF proxy call fails because the InnerChannel (m_inner_channel = m_channel_factory.CreateChannel ()) in the proxy object is null.

Here is an example for illustrative purposes:

 //Call to external REST API Service (works)
 user = await m_http_client.GetProfileAsync(id).ConfigureAwait(false);

 //Call to WCF Service (works)
 using (WCFServiceProxy wcf_proxy = new WCFServiceProxy())
 {
     config = await wcf_proxy.GetConfigAsync(user.ssid).ConfigureAwait(false);
 }

The above code works, however, if I implement the code below the WCF InnerChannel proxy (m_inner_channel = m_channel_factory.CreateChannel ()) is null when I make a service call:

 //Instantiate WCF Proxy - Creates ChannelFactory
 WCFServiceProxy wcf_proxy = new WCFServiceProxy()

 //Call to external REST Service (works)
 user = await m_http_client.GetProfileAsync(id).ConfigureAwait(false);

 //Call to WCF Service (InnerChannel is no longer instantiated)
 config = await wcf_service.GetConfigAsync(user.ssid).ConfigureAwait(false);

, , :

 //Instantiate WCF Service
 WCFServiceProxy wcf_proxy = new WCFServiceProxy()

 //Call to WCF Service (works)
 config = await wcf_service.GetConfigAsync("2423432").ConfigureAwait(false);

 //Call to external REST Service (works)
 user = await m_http_client.GetProfileAsync(id).ConfigureAwait(false);

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