Aadhaar Authentication Failed

How Aadhaar Authentication Works

When you place your finger on a scanner or enter an OTP, the device sends your data to UIDAI's Central Identities Data Repository (CIDR). The CIDR compares what you just provided against what's stored in its database. If it matches, authentication succeeds. If it doesn't, you get an error.

There are three types of Aadhaar authentication:

• Biometric: Your fingerprints or iris scan are compared against the biometric data captured during your Aadhaar enrolment.
• OTP: A one-time password is sent to your Aadhaar-linked mobile number. You enter it, and the system verifies it.
• Demographic: Your name, date of birth, gender, or address is compared against what's in the Aadhaar database.

Reason 1: Your Biometrics Are Locked

This is the single most overlooked reason for biometric authentication failure. If you (or someone with access to your Aadhaar) enabled biometric locking through the myAadhaar portal or the mAadhaar app, your fingerprints and iris scans are completely blocked from authentication. Every biometric attempt will be rejected until you unlock them.

The system returns Error Code 330 (biometric data did not match) in some cases, or the operator's screen may simply show "Authentication Failed" with no further detail.

You need to temporarily unlock your biometrics before attempting authentication again. You have a 10-minute window after unlocking.

Through the myAadhaar portal: Log in at myaadhaar.uidai.gov.in, go to Lock/Unlock Biometrics, and click Unlock. Verify with OTP. Your biometrics will be available for 10 minutes, then automatically lock again.

Through the mAadhaar app: Open the app, tap the three dots in the upper right corner, go to Biometric Settings, uncheck "Enable Biometric Locking," and confirm with OTP. Same 10-minute window.

Via SMS: If you don't have internet access at that moment, you can unlock via SMS. Send UIDUNLOCK [space] last 4 digits of your Aadhaar to 1947 from your registered mobile number.

Reason 2: Worn or Faded Fingerprints

This is the most common cause of biometric failure in India, and it disproportionately affects the people who need Aadhaar authentication the most : manual labourers, farmers, construction workers, and the elderly.

Your fingerprints naturally change over time. They fade with age, get worn down by physical labour, and can be damaged by chemicals, cuts, burns, or skin conditions. If your fingerprints have changed significantly since you last enrolled or updated your Aadhaar biometrics, the scanner won't find a match against the data in UIDAI's database.

How to Fix (Immediate)

Try a different finger. You gave all 10 fingerprints during enrolment. If your thumb isn't working, ask the operator to try your index finger or another finger. Some fingers may have better-preserved prints than others.

Clean and dry your fingers. Moisture, dust, oil, ink, or dirt on your fingertips can prevent the scanner from reading properly. Wipe your fingers clean and dry them thoroughly before scanning.

Ask the operator to try iris authentication. Many modern biometric devices support iris scanning. If the device at the location has an iris scanner, ask the operator to switch to iris-based authentication. This works especially well for elderly individuals whose fingerprints have faded but whose iris patterns remain stable.

Switch to OTP authentication. Most services that use biometric authentication also accept OTP-based authentication as a fallback. Ask the operator to use OTP mode instead. An OTP will be sent to your Aadhaar-registered mobile number. This solves the immediate problem.

How to Fix (Long-term)

Update your biometrics at an Aadhaar Enrolment Centre. Visit your nearest centre and request a biometric update. They'll capture fresh fingerprints, iris scans, and a new photograph. This costs ₹100 (for biometric update). Carry a valid ID proof.

After the update is submitted, it takes about 10 to 30 days for the new biometrics to reflect in UIDAI's system. Once updated, your authentication success rate should improve significantly.

Reason 3: Faulty or Poorly Maintained Scanner Device

Not every authentication failure is your fault. The biometric device at the bank, shop, or ration outlet might be the problem.

Old, dirty, or poorly calibrated scanners often fail to capture fingerprints accurately. Scratched scanner surfaces, low-quality sensors, or devices that haven't been maintained can reject perfectly good fingerprints.

• Ask the operator to clean the scanner surface. A quick wipe with a dry cloth can make a difference.
• Try pressing your finger with slightly different pressure. Too much pressure flattens the fingerprint ridges. Too little doesn't give the scanner enough to read. A moderate, steady press usually works best.
• Ask if there's another device available. Some locations have backup devices. If the current one seems unreliable, ask to try another.
• Visit a different location. If you're at a mobile shop or bank branch and the device keeps failing, try another branch or shop with a different device.

Reason 4: UIDAI Server Issues

UIDAI's authentication servers handle an enormous volume of requests. During peak hours, typically between 10 AM and 1 PM on working days. Servers can experience high load, leading to timeouts, delays, or outright failures.

When this happens, the error message is usually something generic like "Technical error : please try after some time" or "Server not responding."

• Wait and try again. Server issues are temporary. Try again after 15-30 minutes, or come back later in the day when the load is lighter. Early mornings and late afternoons tend to have lower traffic.
• Check if the issue is widespread. If multiple people at the same location are facing failures, it's almost certainly a server issue, not a problem with your Aadhaar.
• Use OTP instead of biometric. OTP-based authentication uses a different server pathway and may work even when biometric servers are under heavy load.

Reason 5: Demographic Data Mismatch

This one bites people when they're trying to link Aadhaar with services like PAN, EPF, bank accounts, or telecom. If the name, date of birth, or gender on your Aadhaar doesn't exactly match what the other service has on record, the authentication fails.

This is particularly common with EPF (Employees' Provident Fund) linking, where even minor spelling differences between your Aadhaar name and your EPF records cause authentication to be rejected.

Check both records carefully. Compare the name, date of birth, and gender on your Aadhaar with what the service provider has. Look for differences in spelling, name order (first name/last name swapped), initials versus full names, or different date of birth.

Update whichever record is wrong. If your Aadhaar has the correct information, update the other service's records to match. If your Aadhaar is outdated, update it through the myAadhaar portal (for address and some demographic changes) or visit an Aadhaar Enrolment Centre (for name, date of birth, and gender changes).

Wait for updates to reflect. After updating either your Aadhaar or the other service's records, give it a few days (sometimes up to 10 days for Aadhaar updates) before trying the authentication again.

Reason 6: OTP Not Received or Expired

If you're using OTP-based authentication and the OTP never arrives, or it arrives but you enter it too late, the authentication will fail.

Check your mobile number is registered with Aadhaar. OTPs are sent only to the mobile number linked to your Aadhaar in UIDAI's system. If you've changed your phone number without updating it in Aadhaar, you won't receive the OTP.

Wait for the OTP. Sometimes there's a network delay. Wait at least 2-3 minutes before requesting a new one.

Don't request too many OTPs in quick succession. There's a daily limit on how many OTPs can be generated for a single Aadhaar number. If you keep clicking "Resend OTP" repeatedly, you might hit the limit and get blocked for the day.

Check your SMS inbox carefully. OTPs from UIDAI sometimes land in spam or promotional message folders on some phones.

Enter the OTP within the validity window. Aadhaar OTPs are valid for a limited time (usually 10 minutes). If you take too long, the OTP expires and you need a fresh one.

Update your mobile number with Aadhaar. If your registered number is no longer active, visit an Aadhaar Enrolment Centre with a valid ID and your new mobile number. The update takes 3-10 working days.

Reason 7: Aadhaar Number Is Deactivated or Suspended

If you see Error Code 996 (Aadhaar cancelled) or Error Code 997 (Aadhaar suspended), the problem isn't with your biometrics or OTP. Your Aadhaar itself is not in an active state.

This can happen if UIDAI detected a duplicate Aadhaar in your name and cancelled the extra one, if your Aadhaar was enrolled fraudulently, if your biometrics haven't been updated when required (for children), or if UIDAI needs you to re-verify your documents.

Verify your Aadhaar status. Go to uidai.gov.in and use the "Verify an Aadhaar Number" tool. Enter your number and check if it shows as active.

If suspended: Visit your nearest Aadhaar Enrolment Centre with valid identity and address documents. A suspended Aadhaar can usually be reactivated by completing the required document or biometric update.

If cancelled: This is more serious. You'll need to visit a Permanent Enrolment Centre with your documents and go through the re-enrolment process. Contact UIDAI's helpline at 1947 for guidance specific to your situation.

Reason 8: Invalid Aadhaar Number

This one is simple but surprisingly common. You (or the operator) entered the wrong Aadhaar number. A single wrong digit means the system is looking up someone else's record entirely, or no record at all.

Double-check your 12-digit Aadhaar number. If you're reading it off a physical card, make sure you haven't misread a digit. If you don't have your card handy, retrieve your Aadhaar number from the UIDAI portal using the "Retrieve Lost or Forgotten EID/UID" option with your registered mobile number or email.

Common Error Codes

You'll probably never see these error codes directly. Most operators just tell you "it failed." But if you can get the operator to check, or if you see the code on screen, here's what the most common ones mean:

Important Notes