Expected Content Unavailable or Options Grayed Out for Tableau User With Full Permissions

Tableau users are unable to see expected content, or some options are grayed out, even though the user and content permissions are set to allow access.
 

Cause

Permissions are set to "Denied" for a different group to which the user belongs (most likely the All_Users group).

All Tableau Server users assigned to any group belong to the “All_Users” group as well.
User permissions on Tableau Server and Tableau Cloud are evaluated across all groups to which the user belongs.
Since "Denied" always takes precedence over "Allowed", the user is unable to see the content/option if it is denied for the All_Users group.