RequestorId: 43249b2e-159c-fd15-d49a-e6fe2986b0cd. Details: System.ApplicationException: HTTP 401 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["0"],"SPClientServiceRequestDuration":["32"],"SPRequestGuid":["7815d093-9be1-41b3-93b0-d254d8164a0a"],"request-id":["7815d093-9be1-41b3-93b0-d254d8164a0a"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"MicrosoftSharePointTeamServices":["15.0.0.4667"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1; RequireReadOnly"],"Cache-Control":["max-age=0, private"],"Date":["Thu, 19 Mar 2015 13:07:33 GMT"],"Server":["Microsoft-IIS\/8.0"],"WWW-Authenticate":["NTLM"],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"]}   at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context)   at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)   at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

Hi,

According to the your description, my understanding is that the workflow occurs the HTTP 401 error in your environment.

This error message "HTTP 401" is related to the user permission. For a better troubleshooting, I suggest you can do as the followings:

1. Be sure User profile synchronization is started.

2. The user by whom you are logged is available in User Profile list. 

3. Final step full synchronization of User Profile Application.

Here are some more detailed articles for your reference:

SharePoint 2013 Workflows - Suspended state HTTP 401 Error

SharePoint 2013 Workflow gets canceled automatically

Thanks

Best Regards