OnlineSubsystemNull: Listen Server w/out microphone will drop clients with microphone if voice is enabled

I have this in my DefaultEngine.ini for an online Steam voice project. I’m not sure if it helps but I heard voice needs greater than the default 10k per client.

[/Script/OnlineSubsystemUtils.IpNetDriver]
MaxClientRate=30000
MaxInternetClientRate=60000
 
[/Script/Engine.Player]
ConfiguredInternetSpeed=30000
ConfiguredLanSpeed=60000

Maybe worth a try. Good luck.