I have a 2003 AD domain setup and a 2012 AD domain we are migrating to. I have a 2 way transitive trust with SID filtering disabled between them. I am using ADMT to transfer the user accounts and groups to the new domain. I am using the option in ADMT to transfer SID history. I am able to transfer groups and accounts fine and can check with ASDI edit the SID history is intact OK.
The issues comes in with this: If I have on the old domain \oldfs\oldshare01 with full share permissions to everyone and GroupA ReadWrite with my migrated user a member of GroupA, I cannot access the share folder. If I go to the same folder \oldfs\oldshare01 and add in email@example.com explicitly I can now access the files in the folder. So it seems to be something with the group. Again I have migrated GroupA into the new domain and it has the old SID and it has migrated user in the new domain as a member
forgot to mention that the file server is in a child domain
domainold.com <---2 way transitive trust--> domainnew.com