What is the Push-to-talk button?

The Controls menu does not show what key (on keyboard) or button (on controller) to press when you want to talk. Does anyone know what button it is?
Also, what is the PTT button for MCC?

> 2533274818084099;1:
> The Controls menu does not show what key (on keyboard) or button (on controller) to press when you want to talk. Does anyone know what button it is?
> Also, what is the PTT button for MCC?

I see this didn’t get a response - if you go into settings and select keyboard/mouse, it’s way near the bottom under ‘Communication’.

Looks like by default for infinite that it isn’t set at all.