Switching online-mode

[Tzk]

Maybe having a look at other Auth plugins helps?

FlexibleLogin [v0.17] for Sponge 7+ - Auth plugin - 2FA

FlexibleLogin Security Notice: If you use a version 0.16.X version, update immediately to 0.16.5+ or disable the change password command. 0.16.X fixed this security bug. Older versions of 0.16.X are not affected. Description A Sponge minecraft server plugin for second authentication. It has a built-in TOTP support. Do you want to let your players protect their account (from hackers/login stealers) and keep playing while the session server is down. You can use this little plugin. You can pr…

Also note that we don’t support cracked servers…
If you want to develop a two factor auth plugin, that’s fine though