ISE 1.2 supported the authorization of users to Sponsor and MyDevices portals based on Identity Group membership and other attributes accessible in identity stores. ISE 1.3 introduced numerous enhancements including the simplification of sponsor and user authorization. However, the new logic limits authorization to group membership. This guide shows two different workarounds for leveraging group membership AND optionally secondary attributes for portal authorization in ISE 1.3-2.1 through the creation of either a RADIUS loopback function or through the creation of a special LDAP identity store which maps attributes of your choice to group membership objects.
ISE 2.2 brings back Sponsor Portal attributes but doesn't address My Devices. This document would also be used for My Devices Authorization for any ISE release >1.3.