Plugin name: [GSA] LockLogin
Plugin link: https://www.spigotmc.org/resources/gsa-locklogin.75156/
Description: This is a plugin that supports 1.8-1.15 and adds an authentication system to the server. It also has 2FA and does not need dependencies.
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.