Microsoft change the minimum requirements for the Multi-Geo capabilities in Office 365 from 2,500 Office 365 licences to 500. What is Multi-Geo? Essentially it allows a single Office 365 tenant to span across multiple Office 365 data centre geographies and gives customers the ability to store their Exchange and OneDrive data, at-rest, on a per-user basis, in their chosen geographies. You can imagine this helps some organisations to meet their data residency requirements.
Find out more about Multi-Geo here: http://bit.ly/2EOBkWx and see page 61 of the June 2019 Product Terms for an overview of the licensing requirements. Find the Product Terms document here: http://bit.ly/MSproductterms.