SDL Language Cloud not offered in list as an MT provider

I have Studio 2017 Pro and I am subscribed to the Basic plan of SDL Language cloud. I am presumably logged in as my name appears next to my green initials at the top right in the Studio window.  I can also access my account from there.  When looking at File - Options or (in a project) Project settings, when I try to add SDL Language Cloud as an MT provider, I do not see this in the list, only File-based, Google,  AnyTM and all the others. What am I doing wrong? Can I have turned off something? Certainly not MT as such, as I do have the Google engine up and running.