Hi Jeremy,
thanks for the advice. We're using Extreme NAC as you're writing and the X440 Series switches. In the NAC we are using the Extreme NetLogin - VLAN ID RADIUS Attributes profile which is working with VLANS, which are not a part of a SPT domain. But I think, the correct RADIUS Attributes profile should be the Extreme NetLogin - Vlan Name profile. I'm going to try it. I'll see if it help.