As you may already know, you were (still are) able to gather all Azure Datacenter IP ranges using XML if you had to manage firewall authorization to Azure services using an XML file (https://www.microsoft.com/en-us/download/details.aspx?id=41653)
Well, this service (the XML file) is being deprecated and removed by June 30, 2020. Instead you now have to use the Service Tag Discovery API (https://aka.ms/discoveryapi) to gather the JSON file.