I am unable to go into Zeus by pressing "Y". I first have to go into MCC, click the Zeus button, close MCC and then press "Y".
Even after getting into Zeus I can not remote control AI, can not use the arsenal with them and can not click on the unit to adjust their skill level, posture, ETC. I can't use any of the ACE option in Zeus IE toggle captive/surrender.
I have tried this with and without mods. Same issue. In vanilla I'm unable to access Zeus at all.