Merge Replication not working with Mirroring for merge subscriber when publisher and subscriber in different domains

We tried creating Merge replication with Sync_Type as "None" along with Mirroring for merge subscriber but were getting following error when publisher and subscriber are in different domain (principal subscriber and mirror subscriber are in same domain):

{call sp_MSsetconflicttable (N'acl_form_group_permission', N'MSmerge_conflict_dmsdb_master_Merge_Repl_acl_form_group_permission', N'ASTDB01\DDMASTER', N'dmsdb_master', N'dmsdb_master_Merge_Repl')}

The same scenario is working fine when publisher and subscriber are within same domain.

Any help will be highly appreciated.

Thank you,

Aakash