> ## 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 how to enable Single Sign-on (SSO) for a tenant using the Auth0 Dashboard. Only for use with legacy tenants.

# Enable Single Sign-On for Tenants

<Callout icon="file-lines" color="#0EA5E9" iconType="regular">
  Only for use with legacy tenants. By default, seamless single sign-on (SSO) is enabled for all new Auth0 tenants, however, legacy tenants may choose whether to enable this feature.
</Callout>

You can enable <Tooltip tip="Single Sign-On (SSO): Service that, after a user logs into one applicaton, automatically logs that user in to other applications." cta="View Glossary" href="/docs/glossary?term=SSO">SSO</Tooltip> for your tenant using the <Tooltip tip="Single Sign-On (SSO): Service that, after a user logs into one applicaton, automatically logs that user in to other applications." cta="View Glossary" href="/docs/glossary?term=Auth0+Dashboard">Auth0 Dashboard</Tooltip>. If you do not choose to enable tenant-level SSO, you may [enable it per application](/docs/get-started/applications/enable-sso-for-applications). If you do not see this setting available in the Dashboard, you already have Seamless SSO enabled; this toggle is strictly for legacy tenants.

1. Go to [Dashboard > Tenant Settings](https://manage.auth0.com/#/tenant).

   <Frame>
     <img src="https://mintlify.s3.us-west-1.amazonaws.com/auth0/docs/images/cdy7uua7fh8z/4okToiwlkNQBxwr8QGE3Rs/7e96db0efab4082ebb9f78cb43ee302c/Basic_Settings_-_EN.png" alt="Dashboard Tenant Settings General Settings tab" />
   </Frame>
2. Go to the **Advanced** tab.
3. Scroll to the **Log In Session Management** section. Locate **Enable Seamless SSO**.
4. Enter the **Inactivity timeout** (default 4320 minutes) and **Require log in after** (default 10080 minutes) fields.

Once finished, you should also [configure your session lifetime settings](/docs/manage-users/sessions/configure-session-lifetime-settings).

## Learn more

* [Single Sign-On](/docs/authenticate/single-sign-on)