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

# Authentication

> Sign-in flows for ABBYY Vantage tenants — by email or tenant login URL, with optional OAuth 2.0 or SAML 2.0 External Identity Providers.

Vantage supports two ways for users to sign in to your tenant: with an **email address** or with a **tenant login URL**. Both methods use the built-in Vantage identity provider by default, and can be configured to authenticate through an [External Identity Provider](/vantage/documentation/tenant-admin/tenant-management/external-identity-provider) such as Active Directory or Azure Active Directory.

<CardGroup cols={2}>
  <Card title="Sign in with email" icon="envelope" href="#sign-in-with-email">
    Users enter their corporate email on the Vantage sign-in page; Vantage routes them to the correct tenant.
  </Card>

  <Card title="Sign in with a tenant login URL" icon="link" href="#sign-in-with-a-tenant-login-url">
    Users follow a tenant-specific URL that takes them directly to their tenant's sign-in page.
  </Card>
</CardGroup>

## Sign in with email

<Steps>
  <Step title="Enter your corporate email">
    On the Vantage sign-in page, enter your email in the **Corporate email** field and click **Proceed**.
  </Step>

  <Step title="Choose a tenant (if prompted)">
    If your email is registered in multiple tenants, choose the tenant you want to sign in to. Otherwise, Vantage takes you straight to the password screen.
  </Step>

  <Step title="Enter your password">
    Enter your password and click **Sign In**. To change the email you entered, click **Switch Account**. If you've forgotten your password, click **Forgot Password?**.
  </Step>
</Steps>

<Note>
  If an External Identity Provider is configured for your tenant, Vantage redirects you to the provider's sign-in page after you enter your email. For more information, see [Authentication using an External Identity Provider](/vantage/documentation/tenant-admin/tenant-management/authenticating-external-provider).
</Note>

## Sign in with a tenant login URL

<Steps>
  <Step title="Open the tenant login URL">
    Follow the URL link. Vantage takes you to your tenant's sign-in page.
  </Step>

  <Step title="Enter your email (if prompted)">
    If the URL includes a `login_hint` parameter with your email, Vantage skips this step. Otherwise, enter your email in the **Corporate email** field and click **Proceed**.
  </Step>

  <Step title="Enter your password">
    Enter your password and click **Sign In**. For URL format and rules, see [Tenant login URL](/vantage/documentation/tenant-admin/tenant-management/tenant-login-url).
  </Step>
</Steps>

## Related topics

<CardGroup cols={2}>
  <Card title="Setting up an External Identity Provider" icon="shield-halved" href="/vantage/documentation/tenant-admin/tenant-management/external-identity-provider">
    Connect an OAuth 2.0 or SAML 2.0 Identity Provider for SSO
  </Card>

  <Card title="Authentication using an External Identity Provider" icon="user-shield" href="/vantage/documentation/tenant-admin/tenant-management/authenticating-external-provider">
    How users sign in once an External Identity Provider is configured
  </Card>

  <Card title="Tenant login URL" icon="link" href="/vantage/documentation/tenant-admin/tenant-management/tenant-login-url">
    Tenant-specific sign-in URLs
  </Card>

  <Card title="Associated email domains" icon="at" href="/vantage/documentation/tenant-admin/tenant-management/email-domains">
    Allow users from specific email domains to sign in
  </Card>
</CardGroup>