> **Source:** https://knowledge.leegality.com/document-execution/leegality-features/invitee-level/security/two-factor-authentication
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# Two Factor Authentication

**Two Factor Authentication** enhances document security by requiring invitees to authenticate using OTPs sent to both their Email ID and Phone Number before accessing the document. This ensures an additional layer of protection, preventing unauthorized access even if the signing invitation is mistakenly forwarded.

To enable this feature, both the Email ID and Phone Number must be configured during document creation.

## How Two Factor Authentication Works  

1. **Signing Link Accessed via Email or Phone Number:**  
   - **Via Invitee Email:** If the signing link is accessed through the invitee's email, this counts as one authentication. The invitee will only need to complete OTP authentication for their mobile number.  
   - **Via Invitee Phone Number:** If the signing link is accessed through the invitee's phone number, this counts as one authentication. The invitee will only need to complete OTP authentication for their email.  

2. **Signing Link Accessed via Other Sources:**  
   - If the signing link is accessed through any other source, both OTP authentications will be required—one for the email and one for the phone number.

## Use Two Factor Authentication

> **Info — Note**
>
> 2-factor authentication doesn't work with Quick Sign

> **Info — Note**
>
> Organisation Admins can enforce Two-Factor Authentication (2FA) for all documents sent from their accounts to enhance security. To learn how to enable this setting, [**click here**](https://knowledge.leegality.com/document-execution/settings/Department/document-security-settings)