Thanks for the reply.
I've upgraded to AAM 5.9 but am still experiencing issues.
I have now created two test roles and a test user (TestRoleA, TestRoleB, TestUser) and have assigned BOTH roles to TestUser.
The roles are being used to limit page access so I have two test pages (TestPageA, TestPageB). I have used AAM to "limit" access to both test pages for Default but I have granted access to TestPageA for TestRoleA and to page TestPageB for TestRoleB.
This scheme works well and functions as expected when I assign only ONE role to TestUser. However it DENIES access to BOTH pages when I assign both roles. I want the exact opposite - the user should gain access if ANY role allows it.
Furthermore, I have read and set the ConfigPress settings as per this post post: https://aamplugin.com/article/wordpress-access-control-for-users-with-multiple-roles
But it doesn't seem to have taken effect...
Must I somehow "enable" the ConfigPress changes I made?