CC1 External Emergency Button

Hi, I was trying to integrate an external E-Stop, on a GM KRC2, and CC1 plug,

I connected 5 to 9 (ESPB1 to No external emergency stop 1) to a NC Estop Switch,
and ESPB11 to 24V Ext Emergency Stop 1, pin 6 to 10, to a NC E-stop Switch,

2 NC switches on the same E-stop button,
which I understand a dual channel is required from the manual.

the E-stop works turns off the drives and stops the same way as the local E-stop, but once I acknowledge the Estop Message the message goes away but the drives won't come on, till I go and press the Local E-stop and acknowledge the local E-stop message and drives come on,

i can acknowledge the local E-stop either external button or pendant both work,
but the external E-stop Message goes away after Acknowledge but drives won't come on.

what have I messed up, or why does it not work?

thanks.

When I connect as follows it seems to work.

24V EXT -- Emergency Stop 1
0V EXT --- Emergency Stop 2

if it's wrong, please correct me.

thanks.