---
title: "Changes to Sign-in step 1: verify credentials and start a step-2 session"
method: POST
path: "/identity/sign_in/step_1"
---

# Changes to Sign-in step 1: verify credentials and start a step-2 session

`POST /identity/sign_in/step_1`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 2 of 55 revisions.

- **2026-09-01** `f2d9f80610d9` — 1 info
- **2026-08-06** `fe2041c5ba86` — 1 warning

## Changes

- **2026-09-01** `f2d9f80610d9` — 1 info
  - added the optional property `error/api_client_id` to the response with the `default` status
- **2026-08-06** `fe2041c5ba86` — 1 warning
  - changed the pattern of the request property `required_group_id` from `^grp_[0-9a-hjkmnp-tv-z]{26}$` to `^grp_[0-7][0-9a-hjkmnp-tv-z]{25}$`

---

[Operation](https://skmtc.dev/stablesea/apis/stable-sea-backend/docs/identity/sign_in/step_1/post.md) · [API](https://skmtc.dev/stablesea/apis/stable-sea-backend.md) · [Page](https://skmtc.dev/stablesea/apis/stable-sea-backend/changes/identity/sign_in/step_1/post)