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When 2FA is on, signing in takes your password and a one-time
code emailed to .
Email delivery isn't configured on this server yet,
so one-time codes can't be sent. Turning 2FA on now would lock you out.
2FA is on. Each sign-in sends a one-time code to
.
Lost access to that mailbox? A superuser can help in the admin UI.
2FA is required for every account on this
server, so it can't be switched off here.