Proton allows sign-ups without a recovery email.

If you're in the official app, ensure you're using your email address and main Proton password .

If your paper discusses security protocols, you might mention: Two-Factor Authentication (2FA)

“I’m clean. Used a random login.”

: If you use OpenVPN or IKEv2 clients, you must use a unique OpenVPN/IKEv2 username found in your account dashboard under the "Account" section.