In a configuration where Active Roles is managing the local domain where the Active Roles Administration Service is installed as well as a remote domain, and a Workflow is used to perform a search in the remote domain, the Search activity in the Workflow will fail with the ERROR:
The user name or password is incorrect.
The Workflow search root is an sub-Organizational Unit or Container in the remote domain
The remote domain is not being managed using an account that is a member of the Domain Admins Active Directory Role Group.