I don't know if anyone else signaled this, but here's what I found. The file shipclass.dll is detected as infected by my antivirus (Avira); everytime I try to log in with the antivirus active, it prevents access to that file, and the account gets banned by (I presume) the anticheat.
I tried running the game with the antivirus deactivated, and everything went smoothly.
Now, deactivating the antivirus can be ok as a temporary solution, but we can't just turn off our security to play Disco, please devs find a solution. Thank you.