HASSIO not transmitting to Smartthings Bridge

I’m hoping someone can help me here.

I’m running HASSIO on Ubuntu 18.04 LTS via virtualbox on my Windows 10 PC.

I’ve installed this https://github.com/vkorn/hassio-addons/tree/master/smartthings to connect up HASSIO and the Smartthings Hub.

I am able to receive the notifications from the Smartthings Hub to HASSIO however I’m unable to send commands to the Smartthings Hub from HASSIO.

I believe its either the MAC address that maybe wrong as I’m not sure if it should be the MAC address of my Windows !) PC, the Mac address of the Virtualbox or the MAC address of the docker ( I read it maybe this).

I’ve tried all the MAC Address and updated the Smarthings Bridge etc but its not working. I’m also unsure where I should be looking for any errors to help me resolve this.

Any assistance is very much appreciated.

Thanks you.