CHW-4114 TOTPAlreadyEnabled

two-factor authentication is already enabled; disable it before re-enrolling

Default message: two-factor authentication is already enabled; disable it before re-enrolling
HTTP status: 409 (client)

Problem. Setup was requested for a user who already has 2FA enabled. Cause. The user completed 2FA enrolment previously. Fix. Disable 2FA first if the goal is to re-enrol with a new authenticator. HTTP 409.