I'm going to presume that this isn't available to anyone who has a Google Apps account, as that has been the trend of nearly all product launches by Google recently.
Yeah, as someone who has had an Apps account for a long time, it sucks that we are constantly and consistently the last ones to get access to new products. We're PAYING them, damnit.
https://productforums.google.com/forum/#!topic/play/86WVa8b_...
Not available to Apps accounts:
* Google Family Library Sharing (Android apps sharing)
* Google Play Music Family Sharing (music collection sharing)
* Project Fi
* Google Spaces
* YouTube Red
* YouTube Music
Given that is most of the recent product launches, the chances of Duo and Allo being added to that list would appear to be very high.