i was trying to play online and i needed the login code, i didn't received any email, and i wasn't logged on the site, only on the forum. I'm not getting emails from classicube and i cant play online

You will need to join the discord and DM AndrewPH or 123DMWM about it: https://discord.gg/DvYYyRw

(If you can't join the Discord, then unfortunately, I can't really help you on that.)