Voice chat works only from server to client [Steam onlinesubsystem]

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Hi,
I’m trying to figure out how setup voice chat for Steam onlinesubsystem.

I put these lines into my config files:

[Voice]      
bEnabled=true

[OnlineSubsystem]
DefaultPlatformService=Steam
bHasVoiceEnabled=true

so voice chat is always ON. Problem is client can hear the server but not the other way around.
Server cannot hear the client who is talking. Did anybody met same issue ?

I read through few post here on Answers and didn’t find anything that would explain why voice works only one way.
I will be glad for any help.

Thanks,
Jakub