Xiaomi gateway won't connect

I’m an OH newbie and I’m struggling to connect a Xiaomi Gateway V3. When I search from inbox with the the Mi Smart Home Gateway binding (which lists this gateway model as a supported device) nothing is found. I have tried to add the device manually as a bridge and as a gateway, neither will come online, it remains as uninitialised and then goes offline. Strangely it is detected with the Mi IO binding but that gives me no functionality.
I have the developer key and IP but nothing helps, I also confirmed that the gateway is on the same network as OH on the pi but cannot connect.
Can anyone help - this is driving me nuts!