Assigning IP address to 82599

Hi

I have Intel 82599 Dual port on Installed on Windows 2012 Server . When I directly assign the IP address to one of the Network adapter it doesn't work . It say unidentified network and cannot ping or do anything.  However If I create a team and assign an IP to virtual adapter It works fine .

Does anyone have idea where I'm going wrong.

Thanks

mumtaz