When you added Hue to ST… do you remember which option you chose?
- Connect to SmartThings Hub
- Link Account
There is also a community developed Edge Driver for Hue that you can look at:
https://community.smartthings.com/t/st-edge-philips-hue-lan-beta/249030 and you can ask the developer questions over there
I use to have 3 hue bridges connected at one point using the Connect to SmartThings Hub option.