This is non-negotiable. With 2FA enabled, even if a hacker steals your password, they cannot log in without the time-based code from your phone (Google Authenticator, Aegis, or Proton’s own authenticator).
This article dives deep into everything you need to know about your ProtonVPN login credentials. From where to find them, how to reset a lost password, what to do if you forget your username, and—most importantly—how to avoid the dangerous pitfalls of buying or sharing leaked accounts.