Setting permission for anything doesn't seem to propagate or use the permissions from the linked accounts. They only way I can assign permission is by using Outlook, Logging on with a local forest account that I have assigned as a owner to the mailbox. Then assign permissions for a use to individual folders or calendars through account properties in outlook.
It appears to assign permissions to the mailbox but it assigns the resource forest account which is disabled and doesn't seem to be able to translate that to the account forest.
As you can see from the attachment OCWCOG is the account domain and COGNET is the resource domain. Accounts bellow that have OCWCOG were propagated during migration from Exchange 2007 to Exchange 2013 and work fine. Any accounts I try and add currently on old or new mailboxes do not take. Very inconvenient and I'm not sure why this is being such a problem but it is very inconvenient.
Has anyone else experienced this?