When adding 2FA support, i propose the following options:

Admin can select/enable a set of 2FA ways (messanger_module, 2fa_plugin or 2fa via email)

User: choose 2fa options based on admin_enabled_options

with messanger options:

• discord (send/verify code)
• sms via twillio (send/verify code)
• sms via $gdpr_friendly_eu_business (send/verify code)
• ......

2fa plugin options:

• google authenticator
• otp (any open source variant like https://freeotp.github.io/ )
• ubikey

2fa_mail

• Send /Verify code by mail