> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# User sign-in (contents)

> Overview of XBOX services user sign-in, account access, and identity APIs including XAL and XUser for GDK and cross-platform title development.

This section covers authentication and account access, XAL, and `XUser` API topics.

## In this section

[Account authentication and access overview](https://docs.xbox.com/services/xbox-services/fundamentals/identity/auth/live-authentication-overview.md)
Describes how to authenticate and access accounts, use the XBOX Authentication Library, and use XUser API contents.

[Troubleshooting XBOX services sign-in](https://docs.xbox.com/services/xbox-services/fundamentals/identity/auth/live-troubleshooting-sign-in.md)
Troubleshooting issues with XBOX services sign-in, such as correct sandbox and configuration IDs.


## Related topics

- [XR-052 User State and Title-Save Location, Roaming and Dependencies](https://docs.xbox.com/publishing/certification/xr/xr-052.md)
- [XGameSave API overview](https://docs.xbox.com/build/core-features/common/game-save/xgamesave.md)
- [Troubleshooting Xbox services sign-in](https://docs.xbox.com/services/xbox-services/fundamentals/identity/auth/live-troubleshooting-sign-in.md)
- [Xbox services sign-in for title websites](https://docs.xbox.com/services/xbox-services/fundamentals/s2s-auth-calls/service-authentication/live-website-authentication.md)
- [SigninUser](https://docs.xbox.com/reference/tools/xtf/xtfuser/classes/IXtfUserClient/methods/signinuser-ixtfuserclient-xtfuser-xbox-windows-m.md)