Sorry if this is a dumb question…I am fairly new at this
out puts 1-6 have no signal? Stereo outputs are fine?
But what have you done so far? Not enough information to identify the problem.
The default patch for the outputs 1-6 are mix (aux) outputs.
What signal are you expecting from them? Have you sent any channel strip to any one of the outputs?
Each output has its own mix. You need to set send levels for inputs you want to appear at a given output, and set the output volume level. The easiest place to do this is the Fader screen. Touch the “Sends To” selector, switch to the desired output, and then set levels for both the inputs you want to send to it, and then the overall output volume with the fader on the right.