Page permissions in Confluence are handled by allocating either users or groups to them. Those two things are Confluence specific objects. Although Confluence can use its internal directory to hold them, it can also ask other services to provide them - Crowd is one route, LDAP is another. Active Directory is a form of LDAP. But distribution lists are NOT groups. They are distribution lists. If you want to use them to control Confluence access, then you need to convert them to groups. Probably via Active Directory.
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