Still having this issue. My brother and I just installed it and tried to connect via lan which it returned the same error. Hi there, i got the same problem connecting to the lan game with my wife. we have both installed our computers and minecraft today, i can figure out what we are...
I use TailScale to form a direct IPv6 tunnel to a cloud instance then use NGINX Proxy Manager with streams to expose my local services to the instances IPv4 address (eg Minecraft server and Plex) You can basically do anything nowadays without a public IP but it does add 1 hop for latency...