I used https://www.boxentriq.com/code-breaking/vigenere-cipher .

As you might have seen, there aren't any new posts on twitter from mcpltokgen. Go to https://mailer.mucomplex.com and send an email to r.child@musmidz01.mu . You should now be able to get the password.

I know the devs gave us this information in the discussions but i was looking up guides for like 30 minutes before I saw that. Just don't want it to happen to anyone else.