The signaling between the EVSE and the car requires the plug to be fully inserted to work. THis is probably even more important with CCS charging, since with the extra wires and pins, the cable and plug are heavier and there's a bit more resistance. If you can hear the contactor in the EVSE, it should open/close as you push the locking button/release it IF it is seated properly. There's a switch connected to that button, which is one of several interlock signals.
2011 535i x-drive GT, 2014 i3 BEV