Help required with Chat room security

I am running OF 3.6.4 on a Windows 2003 Server with an Oracle backend, utilizing Active Directory for account managemnet. I have a very large user base some 40,000 Plus. My user accounts are members of Global Groups that in turn are members of Universal and then Domain Local groups. I am trying to set permissions on a Chat room using the Domain Local groups. I cannot seem to get this to work. I am limiting access to the chat room for members only and can only gain access if I place an individual users JID as a member of the group. Username@server.domain. I am wanting to use Domainlocalgroup@server.domain. I can search and find the DLG and note that the users and other groups are members. What am I doing wrong here! Help would be appreciated. Thanks

Can anyone help me with this ?