---
title: "Provides a challenge for the Passkey to authenticate."
method: POST
path: "/v1/passkey/StartAuthentication"
tags: ["Accounts"]
---

# Provides a challenge for the Passkey to authenticate.

`POST /v1/passkey/StartAuthentication`

## Response `200`

OK

- RobloxAuthenticationApiModelsResponseStartAuthenticationResponse
  - `authenticationOptions` string
  - `sessionId` string

## Other responses

- `403` — 0: Token Validation Failed
- `503` — 2: Feature disabled.

## Changes

- **2026-09-03** `d9b4ae8b3380` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/roblox/apis/roblox-api/changes/v1/passkey/StartAuthentication/post.md)

---

[API](https://skmtc.dev/roblox/apis/roblox-api.md) · [All operations](https://skmtc.dev/roblox/apis/roblox-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/roblox/roblox-api/revisions/d9b4ae8b3380/schema)