When connecting to Box via FTP you are logged into a session that is specific to your user account even if you are the Box administrator. In standard FTP server administration practice you can set which directory a user is dumped into upon login. There should be an administrator level setting that can be enabled to choose at which level the Admin account gets logged into, in this case the FTP root.

Currently when logging into Box FTP via Admin account you are defaulted to \FTP.box.com\Users\Admin and do not have permissions to jump up a directory to \FTP.box.com\Users

You should be able to access \FTP.box.com\Users in order to manage all the accounts you can manage within the Box.com portal, since you are logging in as the Admin account.

Currently the Admin account accessed with Box FTP only acts as a standard user account. This should be something you can enable in the portal with a tick box under FTP settings such as 'Enable root level FTP access' so it is more secured by default but can be enabled when you need to utilize this level of access.

Thank you