After adding a WLC to ISE if you get the following error (See message below) after running debug aaa tacacs enable in the WLC. Incorrectly formatted authorization message Here's what you need to do to fix it. Login to ISE Work centers, Settings, Device administration, Policy Results, TACACS Profiles under here. You want to create new attribute (See picture below). then you want to go to Policy set and assign the new attribute you just created and assigned to your existing wireless policy. this step fixed the this issue for me.