Hello! I'm trying to play online, but it seems like cross-play isn't working. The option to host a lobby is greyed out when cross-play is enabled, and the game never finds any public lobbies. The GOG support website suggests allowing port 10801 through the firewall, but that didn't work. I'm running the linux version with the Heroic launcher.

EDIT: Turns out online multiplayer isn't supported on Heroic yet. I misread their FAQ and thought it was. They list it as a planned feature though, so hopefully it will be available soon.