Impossible to speak in co-op mode

[laptander]

While playing in multiplayer mode, it is impossible to talk to each other.
Lets say my laptop is laptop1 and my friend's laptop is laptop2.
laptop1: runs Arch Linux and has windows 10 in dual boot.
laptop2: runs openSuse and has windows 10 in dual boot.
Does not matter the way you choose to speak: "press button to talk" or "any speech".
We have tested the following cases

№	Laptop1	Laptop2	Result
1	Windows	Windows	can speak normally
2	Linux	Windows	unable to hear each other
3	Linux	Linux	unable to hear each other
4	Windows	Linux	unable to hear each other

The strange thing is that sound is not transmitted even with the same windows configuration, while anybody swithes to Linux. So, if anybody of us is running linux, it is impossible to speak.
And yes, both laptops while on linux are indicating that their microphone is working under audio settings.

Let me know, if I need provide some additional information.