UI 12 Aux sends

Now I know im missing something but here we go:
I want to use headphone 1 & 2 as aux 3 & 4 mono. I plug headphone into Aux 3 but only get 1 side when I bring it up. I get the other side if I bring up Aux 4. How can I get both left & right to work at once on 1 aux?
I havent had a way to test this in 1 & 2 because they are XLR out but will these 2 be the same?
Thanks everyone

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