Craftopia Online Workaround
Online seems to have issues. Use Hamachi to solve the problem and play with your friends.
Proof it works:
Hamachi is a VPN that emulates a Local area network you can then use your IPV4 IP on that program and connect to your friends lobby.
Or just go into your router settings and port forward ports 8787 through 8790 both udp/tcp and then you can have your friends join via steam.
