I just figured out the problem. There are quite a few things that must be correct. From the Unix menu, select Switch Interface Administration, Call Data Int. Admin, Device Assignment. The switch id should be 1 and the device should be 2,3. Then go back to the main menu. Select Voice Sys. Admin., Voice Equiptment. Use F8 to assign Group 3 to Channel 0 and unassign group 2 from channel 0. On the same screen, change PBX extension to Channel and make sure channels 0 through how ever many ports you have match the audix hunt group members in the PBX. Channel 0 must match hunt group member 1 and so forth. Lastly, go back to the main menu. Select Switch Int. Admin, Call Data Int. Admin, MWI Admin., MWI Parameters. The codes to turn the message lights on and off must match the feature access codes in the switch next to Leave word calling send and Leave word calling cancel. With all of these, you should be fine.
Note, you must have a craft login to change Device Assignment.
Good luck.