Oh my. We have a new administrator and he seems to have all his permissions set but there is no Studio icon he can click on in his menu. We cleared all the caches. I could not find a menu in Navigation where this might be added.
Administrators don't have access to Studio. Only "Operator" does. To make someone an Operator go to Accounts app in UNA and use "Make Operator" button. Note, that it is a high level access that may be disruptive, so it should be given to trusted accounts only.