If it’s anything like the old MR and UR units then you’ll likely need to open the units mixer on the computer and set up each channel panned hard left and right, Ch1 L, Ch2 R, Ch3 L, Ch4 R.
As for the connectivity issues, I have no clue. I was very interested in these units but in the end opted for Apollo x’s as saw little going on via the forums. I have my MR units slaved to them and its a great setup. The MR units are still awesome.