LAN World Support

Bedrock Voice Chat does not support LAN worlds.

BVC needs a behavior pack running on the world host to relay player positions. A LAN world is hosted by the Minecraft game client, which cannot load server-side behavior packs — so there is nowhere to install the pack.

Proxy Connect does intercept Bedrock's network protocol for Aternos and Realms, but that works because those are real servers you can upload a world — behavior pack included — to. A LAN world has no such upload path, so proxying alone would not give BVC the position data it needs.

HOWEVER, running Bedrock Dedicated Server is trivial. Simply download Bedrock Dedicated Server, and run it locally instead of a LAN world and you can run a fully supported Bedrock Voice Chat instance.