nsumner wroteYou probably figured it out already but I faced the same problem and the solution is really very simple.
Let us say you have a user with username "user1". You create a user called user1 and assign them to the appropriate group. They will authenticate via RADIUS if that is what you have set but the AS sees that they are "user1" and gives them appropriate permissions.
I would rather get the membership info from RADIUS (which means I could keep everything in "1 place" (Active Directory) which is possible (from NPS at least) but all in all it doesn't make that big a difference, since I don't have thousands of users.
That did not work for me. The per-group-settings (which subnets are announced and such) did not work when I did just that.