# Page Not Found

The URL `api-clients/user-identities/add-an-acs-user-to-a-user-identity` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Managing Phones for a User Identity](https://docs.seam.co/latest/capability-guides/mobile-access/managing-phones-for-a-user-identity.md)
- [Managing Mobile App User Accounts with User Identities](https://docs.seam.co/latest/capability-guides/mobile-access/managing-mobile-app-user-accounts-with-user-identities.md)
- [Using User Identities to Scope Users' Device Access](https://docs.seam.co/latest/ui-components/overview/using-user-identities-to-scope-users-device-access.md)
- [Adding Custom Metadata to a Device](https://docs.seam.co/latest/core-concepts/devices/adding-custom-metadata-to-a-device.md)
- [Adding Custom Metadata to a Connected Account](https://docs.seam.co/latest/core-concepts/connected-accounts/adding-custom-metadata-to-a-connected-account.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://docs.seam.co/latest/capability-guides/mobile-access/managing-phones-for-a-user-identity.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://docs.seam.co/latest/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://docs.seam.co/latest/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/latest/capability-guides/mobile-access/managing-phones-for-a-user-identity.md`).

You may also use `Accept: text/markdown` header for content negotiation.