Talkback Mic always on when routing over AVB

I have a 24 channel studiolive series 3 connected to a stagebox and 5 earmixes. I have decided to just send 15 channels and Talkback over AVB to all 5 earmixes. I have talkback on AVB channel 12. The issue I have is that talkback is always on now. Do I have to route talkback over a mix for 'talk" button to tu the mic on/off Recent Questions...