Ok the guys over at the TFS Integration Platform MSDN forum provided the solution. I just repeat it here: Add or extend the <UserIdentityMappings> element in your configuration xml. This element is inside the <SessionGroup>. It sould lokk something like this: <UserIdentityMappings EnableValidation="false"> <UserIdentityLookupAddins /> <DisplayNameMappings DirectionOfMapping="LeftToRight"> <DisplayNameMapping Left="svnuser1" Right="domain\user1" MappingRule="SimpleReplacement" /> <DisplayNameMapping Left="svnuser2" Right="domain\user2" MappingRule="SimpleReplacement" /> </DisplayNameMappings> </UserIdentityMappings> This worked form me. - Jonas Bandi