SSRS without domian

I have inherited a 10.2.500.4 system that is not on a domain. Everything functions within application outside of SSRS deployment. Support tells us we need a domain, yet along the way someone in the process stated no need for a domain. 2 servers involved also.
Error is
System.Web.Services.Protocols.SoapException: The user or group name ‘XXXX\epicorservice’ is not recognized. —> Microsoft.ReportingServices.Diagnostics.Utilities.UnknownUserNameException: The user or group name ‘XXXX\epicorservice’ is not recognized.

Lot of talent in this group any ideas?


See bottom post. That might be it.

My guess is that the reporting services was setup at one point of time or the server was joined to a domain.