Just a quick note that we expanded our service and now we offer inbound numbers (both PSTN and Conferencing) in Puerto Rico.
If you need some, all you need to do (assuming you have the licenses :)) is to go to the number search window in the Admin Centre and it will show up in the dropdown.
More info about our coverage can be found here: https://support.office.com/en-us/article/Where-can-my-PSTN-Calling-users-call-9fb78723-05f4-4b86-98e...
More to come. Keep tuned :)