Hi, Fong,
Active Users is available in all Adagio modules versions 8.0 and higher. It is available from the Help | About menu within AP8.1A and other modules.
Check Group Security within AP for the user Group the user who cannot access Active Users belongs to. If they are unable to access the Active Users features, it is because they have not been granted permission to do so as a member of the Group they belong to.
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Regards,
Softrak Tech Support