# Detect existing user first login flow

**URL:** <https://forum.keycloak.org/t/detect-existing-user-first-login-flow/22517>\
**Category:** Getting advice\
**Created:** [June 6, 2023, 6:03pm UTC](https://forum.keycloak.org/t/detect-existing-user-first-login-flow/22517 "2023-06-06T18:03:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![v.sorokin](https://avatars.discourse-cdn.com/v4/letter/v/e8c25b/32.png) [@v.sorokin](https://forum.keycloak.org/u/v.sorokin)\
**Post date:** [June 6, 2023, 6:03pm UTC](https://forum.keycloak.org/t/detect-existing-user-first-login-flow/22517/1 "2023-06-06T18:03:02Z")

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Hi everyone! It seems that I have a stupid question, but, I want to be one hundred percent sure that I fully understand how Keycloak works. So, there are two last sentences in the [docs](https://www.keycloak.org/docs/latest/server_admin/#_detect_existing_user_first_login_flow) that say **“With this configuration, Keycloak is unable to determine which internal account corresponds to the external identity”**. But, everything works fine - accounts are linked properly. This statement confuses me completely. What does this statement mean? I did everything according to the section “Detect existing user first login flow” and it works fine… Thanks in advance!