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# Set up an app for two-factor authentication

> Set up an authenticator app for two-factor authentication in Sigma instead of receiving login codes by email.

If you log in to Sigma using a username and password, you receive two-factor codes sent to your email address. If you want, you can set up an app for two-factor authentication instead.

Using an app for two-factor authentication can be more reliable than receiving codes to your email address, and provide a true second factor by requiring you to access a separate device, such as your smartphone, or application to generate the two-factor authentication code.

If you do not have an app set up for two-factor authentication, or if you [ask your admin to reset your authenticator app setup](/docs/manage-password-authentication#reset-two-factor-authenticator-app) in Sigma, you receive two-factor codes to the email address you use to log in to Sigma.

## Requirements

If you use a username and password to log in to Sigma directly, you can set up an app for two-factor authentication.

You must have an app installed on a device that you can use to generate two-factor authentication codes. For example, a smartphone with Okta Verify, Duo Mobile, Microsoft Authenticator, Google Authenticator, or a similar app installed.

## Set up an app for two-factor authentication

To set up an authenticator app for two-factor authentication:

1. In the Sigma header, click your user avatar and select **Profile**.
2. In the **Authentication** section, click **Enroll app** for the **Set up authenticator app** option.
3. Open the authenticator app on your smartphone and scan the QR code or click **Show secret** (<img src="https://sigma-docs-screenshots.s3.us-west-2.amazonaws.com/Icons/eye.svg" alt="" />) to show the secret that you can use as a setup key, then enter the key in your app.
4. In Sigma, enter the 6 digit code generated by your authenticator app.
5. Click **Verify** to complete the setup.

After setting up an authenticator app, you're prompted to enter a code each time you log in to Sigma. Whenever you log in, you can still choose to get a code sent to your email address instead.

## Turn off app-based two-factor authentication

If you lost your device with an authenticator app installed or need to set up a new one, or otherwise want to stop using an authenticator app for two-factor codes, you can turn off your authenticator app. If you turn off app-based two-factor authentication, you instead receive two-factor codes to your email address.

To turn off app-based two-factor authentication:

1. In the Sigma header, click your user avatar and select **Profile**.
2. For the **Set up authenticator app** option, click **Disable**.
3. When prompted, click **Disable**.

You can also ask an admin to do this for you. For admin instructions, see [Reset two-factor authenticator app](/docs/manage-password-authentication#reset-two-factor-authenticator-app).