Fix NSP Aadhaar Face Authentication & Error 904 Guide

Overview of NSP Face Authentication

In 2026, the National Scholarship Portal (NSP) has fully integrated the One-Time Registration (OTR) system to streamline student verification. A critical component of this process is Aadhaar Face Authentication. This technology ensures that the person applying is the same individual listed on the Aadhaar card, preventing identity fraud and ensuring scholarship funds reach the right bank accounts.

However, many students encounter technical hurdles during this step, specifically Error 904 or general biometric mismatches. This guide provides actionable steps to resolve these issues using the official UIDAI and NSP tools.

Understanding Error 904 on NSP OTR App

Error 904 is one of the most common issues reported by students. It typically signifies a communication failure between the NSP OTR mobile application and the Aadhaar FaceRD (L0) service. It can also indicate that the user's biometrics are locked at the UIDAI level, preventing the app from fetching the necessary data.

Primary Causes of Face Auth Failure:

• Biometric Lock: Your Aadhaar biometrics are disabled for security in the mAadhaar app.
• Outdated Software: You are not using the latest version of the Aadhaar FaceRD (Early Access) app.
• Lighting Conditions: Poor ambient light prevents the camera from capturing facial landmarks.
• Network Latency: Slow internet causing a timeout during the UIDAI handshake.

How to Unlock Aadhaar Biometrics for NSP

If your Face Authentication fails despite perfect lighting, your biometrics are likely locked. By default, many users lock their biometrics to prevent unauthorized access, but this must be disabled for the OTR process.

1. Open the mAadhaar App: Log in using your registered mobile number and OTP.
2. Navigate to My Aadhaar: Look for the 'Biometric Lock' status. If it shows a red icon, your biometrics are locked.
3. Unlock Biometrics: Tap on the icon and confirm the unlock request. Note that 'Temporary Unlock' lasts for 10 minutes, which is usually sufficient for the NSP OTR process.
4. Alternative via UIDAI Portal: Visit the official UIDAI website, log in with your Aadhaar number, and navigate to the 'Lock/Unlock Biometrics' section under 'Aadhaar Services'.

Step-by-Step Troubleshooting for Error 904

Follow these steps to clear the 904 error and complete your registration:

1. Update the Aadhaar FaceRD App

The NSP OTR app does not perform face scanning itself; it calls the Aadhaar FaceRD (L0) Service developed by UIDAI. Ensure you have the latest version downloaded from the Google Play Store. If it is already installed, try clearing the cache: Settings > Apps > Aadhaar FaceRD > Storage > Clear Cache.

2. Check App Permissions

Both the NSP OTR app and the FaceRD service require 'Camera' and 'Location' permissions. If you denied these during installation, the authentication will fail instantly. Go to your phone settings and ensure both apps have 'Allow while using the app' permissions enabled.

3. The 'Neutral Expression' Rule

UIDAI's AI is strict about facial expressions. Ensure you are not smiling, frowning, or wearing glasses/caps. Keep your eyes open and look directly into the camera. The app will prompt you to blink to ensure 'liveness' detection.

Common OTR Issues and Solutions

Beyond Face Authentication, students often face issues with data mismatch. If your name on your school records does not match your Aadhaar name exactly, the OTR will fail. In such cases, you must update your Aadhaar details at a local enrollment center before proceeding with the scholarship application.

Checklist for a Successful OTR:

• Stable 4G/5G or Wi-Fi connection.
• A smartphone with at least a 5MP front camera.
• A plain background (preferably white or light blue).
• Latest version of NSP OTR App and Aadhaar FaceRD Service.

Final Recommendations

If you have followed all the steps above and continue to face Error 904, it is possible that the UIDAI servers are experiencing high traffic. Try performing the authentication during off-peak hours (early morning or late at night). If the problem persists for more than 48 hours, contact the NSP helpdesk at helpdesk-nsp@gov.in with a screenshot of the error and your Aadhaar Virtual ID (VID).

Remember, the OTR is a one-time process. Once completed successfully, you will receive a permanent Nodal Officer-verified OTR ID that will simplify your scholarship applications for the rest of your academic career.