Administrator privileges are set at Global Permissions level or vCenter object level and propagated down
Environment
VMware vCenter Server 8.x
Cause
vCenter enforces the rule with least privileges
The user/group may be part of nested groups that have lower privileges assigned to datastore or datacenter objects and these take precedence over the administrator privileges assigned at Global Permissions or vCenter object level
Resolution
Verify that the user/group does not have lower privileges assigned at the datastore or datacenter object level