Rainbow six siege turn off microphone?

I play nornal r6 on the Xbox and I usually talk to my friends about the Xbox Party function. I was wondering if my teammates heard that because there's unfortunately no push to talk. I ask myself that because my teammates spoke to each other in chat and that was really annoying.

No they don't hear you. So at least that's the way it is on Ps4 and I think Xbox does the same.

If you are in a party, as far as I know ingame is always assumed