P24 Faders Have no Effect via Hub TRS Outs

I'm using five P24 Mixers w/ five Audio-Technica ATW-3255 Wireless IEM transmitters. I route each pair of TRS outputs to each of the transmitters. The volume stays at the same level no matter what position the P24's Faders are in.

Made sure I updated all of my P24M and P24H with the latest firmware as of this post.