I wish it worked for us here... I tried everything before finding your article link except for the blank Authorization header (and that did not work
)
I think it's due to my company's proxy settings.
The remote server returned an error:
(407) Proxy Authentication Required.
at Microsoft.Workflow.Common.AsyncResult.End[TAsyncResult](IAsyncResult result)
at Microsoft.Activities.Hosting.HostedHttpExtension.HttpRequestWorkItem.OnEndComplete(ScheduledWorkItemContext context, IAsyncResult result)