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---
# Aadhaar eSign

Aadhaar eSign is a type of electronic signature in India that uses a person's Aadhaar number to verify their identity and sign documents digitally. It is considered legally valid and enforceable in India under the Information Technology Act, 2000.

## Types of Aadhaar eSign

- OTP
- Biometric Thumb
- Iris
- Face

## Use Aadhaar eSign

> **Info — Note**
>
> If multiple Aadhaar eSign methods are selected, the signer can use any one of the available options to sign the document.

## Signing a Document Using Aadhaar eSign

The signer may receive the invitation to sign the document via Email, SMS, or WhatsApp, based on the sender's configuration.

## ESP Errors During Aadhaar Signing

This section lists common errors you may encounter on the eSign Service Provider (ESP) page while signing documents using Aadhaar eSign, along with their causes and solutions.

<table>
  <thead>
    <tr>
      <th>Problem</th>
      <th>Error Message on ESP</th>
      <th>Cause</th>
      <th>Solution</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td rowSpan="2">
        OTP request limit exceeded
      </td>
      <td>
        <strong>NSDL</strong>

        "Failure: You have exceeded Send/Resend OTP Limit. Please try again!"
      </td>
      <td rowSpan="2">
        The signer requested more than three OTPs without submitting any. 

A signer can request up to three OTPs. Attempting to request a fourth will result in an error.
      </td>
      <td rowSpan="2">
        Restart the eSign process from Leegality platform. System will automatically route to an available ESP.
      </td>
    </tr>
    <tr>
      <td>
        <strong>CDSL</strong>

        "The eSign Service Provider (ESP) could not complete the eSign request. Message from ESP – OTP Validation Limit Exceeded"
      </td>
    </tr>
    <tr>
      <td>
        Invalid OTP entered repeatedly
      </td>
      <td>
        <strong>On ESP Page:</strong>

        "Invalid OTP! Please enter correct OTP which was received. X attempt(s) remaining for submitting the OTP."

        <strong>After 3 failed attempts (redirected to Leegality):</strong>

        "The eSign Service Provider (ESP) could not complete the eSign request. Message from ESP – Invalid OTP. No Of Retry Attempt Exhausted!!"
      </td>
      <td>
        The signer submitted an incorrect OTP three times consecutively.

        Each signer gets three attempts to enter the correct OTP before the session is terminated.
      </td>
      <td>
        Restart the signing process using the signing link.
      </td>
    </tr>
    <tr>
      <td>
        Expired Virtual ID (VID) used during signing
      </td>
      <td>
        <strong>On ESP Page:</strong>

        "Expired VID is used in input"
      </td>
      <td>
        The 16-digit Virtual ID (VID) entered, or saved in the browser/application, has expired.

        Aadhaar VIDs are temporary and expire after a certain period or when a new VID is generated.
      </td>
      <td>
        Enter a valid VID to proceed, or use the Aadhaar number directly instead.

        To generate a new VID:
        <ol>
          <li>Visit [myaadhaar.uidai.gov.in](https://myaadhaar.uidai.gov.in) or open the <strong>mAadhaar</strong> app.</li>
          <li>Go to the <strong>VID Generator</strong> service.</li>
          <li>Log in using the Aadhaar number and the OTP sent to the registered mobile number.</li>
          <li>Select <strong>Generate VID</strong> to receive a new 16-digit VID via SMS.</li>
        </ol>
      </td>
    </tr>
    <tr>
      <td>
        Face authentication failure
      </td>
      <td>
        <strong>On ESP Page:</strong>

        "authentication failed! please contact admin"
      </td>
      <td>
        Intermittent issue with Face authentication on the ESP.
      </td>
      <td>
        Retry after some time. This is typically a transient error and resolves on its own.
      </td>
    </tr>
  </tbody>
</table>