Hotspot Login via MAC auth

This seems like a simple configuration.
From my understanding you enable mac authication in hotspot server, and then create a user adding the mac address for the username.

But for the life of me any mac users cannot login via automatic mac authorzation.
Currently i am just tring to get a laptop to automaticly authorise, but ultimatley i need my voip phones to autorise.

Any ideas are very welcomed.

Thanks

this should work : P!