Why can't I get my talback mic working

I received my StudioLive 32 Series 3 in Early July and Updated the firmware at that time. I'm away from the mixer now, so I don't know what version it was.

Anyway, I have a dynamic mic connected to the talkback input. I have adjusted the gain and I can see an input level peaking around -12 db on the input meters. In the Talkback Edit screen, I have set the source to Analog and assigned the talkback to Main, AUX 1, and AUX 2. As far as understand, I should now hear the talkback mic through all 3 of those outputs when I toggle or hold the Talk button, but I get nothing. Am I missing something?

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