---
title: "Start Email OTP Challenge"
method: POST
path: "/challenge/email-otp"
tags: ["Email OTP"]
---

# Start Email OTP Challenge

`POST /challenge/email-otp`

Start a challenge when the user is already enrolled with at least one email OTP authenticator

## Request body

- object
  - `userAuthenticatorId` string — The ID of the email OTP authenticator to use. Only required if the user has multiple email authenticators and you want to target a specific one.

## Response `200`

OK

- object
  - `challengeId` string

## Other responses

- `400` — Invalid Request
- `401` — Unauthorized
- `404` — Not Found
- `429` — Too Many Requests

---

[API](https://skmtc.dev/authsignal/apis/call-connect-api.md) · [All operations](https://skmtc.dev/authsignal/apis/call-connect-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/authsignal/call-connect-api/revisions/5604d744e3ad/schema)