> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.com/llms.txt
> Use this file to discover all available pages before exploring further.

> Describes the potential personally identifiable information (PII) that Auth0 writes to tenant logs.

# Personally Identifiable Information in Auth0 Logs

Many logs in Auth0 tenant logs can contain personally identifiable information (PII). Authentication events trigger log entries that can include users' PII. And if you use the Auth0 <Tooltip tip="Management API: A product to allow customers to perform administrative tasks." cta="View Glossary" href="/docs/glossary?term=Management+API">Management API</Tooltip> or the Dashboard to add users, Auth0 logs the user account details.

These fields in log entries can contain PII:

* Name
* Phone number (used for <Tooltip tip="Multi-factor authentication (MFA): User authentication process that uses a factor in addition to username and password such as a code via SMS." cta="View Glossary" href="/docs/glossary?term=multi-factor+authentication">multi-factor authentication</Tooltip>)
* Email address
* IP address (which can reveal location)
* Any custom user information you define

At no point does Auth0 log <Tooltip tip="Access Token: Authorization credential, in the form of an opaque string or JWT, used to access an API." cta="View Glossary" href="/docs/glossary?term=access+tokens">access tokens</Tooltip> from Auth0 or any <Tooltip tip="Access Token: Authorization credential, in the form of an opaque string or JWT, used to access an API." cta="View Glossary" href="/docs/glossary?term=identity+provider">identity provider</Tooltip>. When authorization code exchanges occur, the logs show only a partial code (for example: `code: 31XXXXX`).

## Learn more

* [Log Data Retention](/docs/deploy-monitor/logs/log-data-retention)
* [Log Search Query Syntax](/docs/deploy-monitor/logs/log-search-query-syntax)