[2021] Team mate cannot join game through steam or in general on a world I host, and every time look at meteor the game crashes?

Yes, the meteor thing is an issue that we thought to have fixed. If you can reproduce the issue, please send an e-mail to [email protected] with your player.log after you crashed due to looking at the meteor in the tutorial: https://github.com/StrangeLoopGames/EcoIssues/wiki/Getting-the-Eco-server-and-client-log-files-for-local-world

In regards to the connection issue I'd need more information as to what actually happens.