Additional user with Administrator role has been created in Users menu, however he cannot create new subscriptions and manage particular settings. For example: Tools & Settings, Additional Apache directives and Additional nginx directives are absent. Why?
By design, user added via Subscriptions > example.com > Users has a limited set of permissions. These users are not considered to perform the same actions that Plesk administrator is able to. If it is required to create user with Plesk administrator privileges, create Additional Administrator Account.
Managing Additional User Accounts