It seems like I cannot join the discord. I’m not sure if it’s a bug or you plan to open it later.
The link probably got expired.
The link to join MineRL challenge Discord is: https://discord.gg/K3HXQkNr7k
NOTE: AIcrowd Discord is different from MineRL Discord and AIcrowd one can be found at: https://discord.gg/3jwn25E
Good catch, thank you! The links have been fixed.