master data services 2012 domain trust issues

hi,

we have a Master Data Services 2012 installation within one domain and the users exist within another domain.  This has a selective trust both ways.

the behaviour that we are seeing in MDS 2012 when adding users to the master data services from the other domain we are getting no exact match found for the users that exists when adding users in;  these users are from the domain that MDS does not reside in but there is a trust in place.

we have given authentication permissions to all users requiring access to the server that MDS resides on.

the question is what steps are necessary to allow MDS to operate in two domain environment.   We have other applications that function in this manner but MDS is causing issues.

any help would be appreciated..

thanks