No voice connection between different regions

Hello!

I've encountered a problem with the voice connection.
I'm using DemoVoiceUI to monitor people currently present in the voice chat. The chat works fine when people are in the one and the same region.
The problem begins when the regions are different, some regions or region combinations simpy don't work together.

People don't hear each other and the speaker prefab doesnt appear in the active coonections list.

We also use PUN2 with Opsive third person controller on the same scene where voice chat is, and all the people in the room can see and interact with each other avatars even if they can't hear. So the problem is with the voice connections only.

In our case :

- India doesn't hear Russia
- Russia allways hears Russia or Ukraine
- Germany hears Lebanon
- but they both doesn't hear Russia while hearing each other
- but Ukraine sometimes hears Germany ( when they are alone in the chat )
- Australia doesn't hear anyone

I tried to add all the regions the white list, tried to leave it empty, nothing seems to work.

Leaving FixedRegion field blank doesn't help also, with "best region" it even stops finding rooms unless regions are the same.

I would be extremelly grateful for any help.

Here's my current server settings :