No, you cannot directly control two Hive hubs with one app. The Hive system is designed to work with a single hub per location. However, there are workarounds depending on your situation:
Various Locations: You can set up distinct Hive accounts with different email addresses if you wish to manage Hive devices in different locations like home or office.
Multi-Zone System (Single Location): One Hive hub can be used to set up a various zone system if you are in a large house and require controlling the hot water, heating, and lights on/off actions in different zones. It allows you to use the same app to control various thermostats for different locations in the house.