USB Camera on G7500 with Direct Join to Team

We are looking to use a E70 or USB Eagle Eye Cube in our conference room. What I am wondering is why doesn't a USB camera work when the G7500 is in Teams mode? Is there another way to connect it to the G7500?

I understand that the G7500 has not made it onto the Microsoft certified list as of yet. Do we know when this will be avaiable? 

Thanks