Workflow not working for users across domains

Question

Hi,
The workflow that i have created works perfectly for me, but they work intermittently for my colleague who sits in another country and hence domain. 
They sometimes work for him, when he creates a new item but they don't work most of the time and below is the error that he gets.
RequestorId: 38647461-0f47-8efc-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException:
HTTP 404 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["0"],"SPClientServiceRequestDuration":["48"],"SPRequestGuid":["38647461-0f47-8efc-8848-9c92f6979b64"],"request-id":["38647461-0f47-8efc-8848-9c92f6979b64"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"MicrosoftSharePointTeamServices":["15.0.0.4569"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1;
RequireReadOnly"],"Cache-Control":["max-age=0, private"],"Date":["Fri, 13 Feb 2015 18:57:19 GMT"],"Server":["Microsoft-IIS\/7.5"],"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)
Please help me to resolve this issue. I need your guidance. 
Thank you !
Kind Regards

Answer 1

Hi Bruno,
Thanks for your response. 
I'm not much in to SharePoint. Me and my colleague have just front end access to the site, we can't access the server. We both are SCA on the site. We are just geographically apart. 
All we can do is "SharePoint Branding". Does this make any sense ? Sorry if couldn't give you much information.
I designed some SP2013 workflows and they don't always work for my colleague. When i go to Designer -> All files -> workflows, i don't see any of my SP2013 workflows, i see only SP2010 Workflows.
I will try to contact the team that has got the server access and will convey them your inputs. 
Kind Regards