Korean Identity Verification Troubleshooter: Why 본인인증 Fails

If Korean 본인인증 fails, start with the screen you are looking at, not with a guess about the cause.

Different screens can use different verification methods, records, and eligibility rules. A Korean phone number, an SMS code, a foreigner registration record, a certificate, a mobile ID, and a bank verification flow are not interchangeable.

Troubleshooter

If SMS arrives but mobile identity verification still fails

Likely issue category:

Carrier-backed identity check still not confirmed.

Receiving an SMS does not prove that Korean mobile-phone identity verification will succeed.

The standard mobile verification flow can depend on a mobile line registered in the user’s own name and on information matching the carrier or service record.

Check next:

• Is the mobile line in your own name?
• Do the details entered on the screen match the record used by the carrier or service?
• If the failure continues, use the carrier’s or service’s official support.

Do not assume that any Korean SIM, prepaid line, or successful SMS receipt is enough for every verification service.

If PASS fails

First identify what PASS means on that screen.

PASS can appear in two different contexts:

• PASS app used as the authentication channel during mobile-phone identity verification
• PASS Certificate — PASS 인증서

These are not the same thing.

If the screen means PASS Certificate, a foreign resident may be able to use it when mobile-phone identity verification is available for that user and PASS app/certificate enrollment is available.

Possible issue categories:

• mobile identity-verification eligibility
• PASS app enrollment state
• PASS Certificate state
• service-specific eligibility

Check next:

1. Confirm whether the screen is using PASS app authentication or PASS Certificate.
2. Check whether mobile-phone identity verification works for your line.
3. Check your PASS enrollment or certificate state.
4. If still blocked, use PASS or carrier official support.

Do not use one fixed rule for prepaid, MVNO, or carrier compatibility unless the current provider documentation confirms it.

If foreign-registration information is rejected

Possible issue categories:

• record mismatch
• unsupported credential
• service-specific eligibility issue

A mismatch between what you entered and the authoritative record used by the service can cause a failure.

But there is no safe universal rule that says every foreign resident should fix this by changing name order, spacing, hyphens, or romanization.

Check next:

• What exact record is this service checking?
• Does the entered information match the relevant carrier, certificate issuer, immigration record, or service account?
• If the record needs confirmation or correction, use the carrier, issuer, immigration, or service’s official support.

Do not try random name permutations or altered identity numbers until something passes.

If only a Korean resident-number path appears

Likely issue category:

A foreigner route may be absent, hidden, or unsupported on this screen.

The screen alone may not be enough to determine which one.

Check next:

• Is there an officially offered foreigner option?
• Is there a mobile-ID option?
• Is there a passport-based option?
• Is another authentication method officially offered?
• If not, use the service’s official help channel.

Do not assume that a hidden or missing foreigner path means the service never supports foreign residents.

If the screen uses Any-ID or another public-service authentication wrapper

Any-ID is a government integrated-authentication layer.

A participating service may offer categories such as:

• mobile ID
• simple authentication
• joint certificate
• financial certificate
• private IDs

But the available methods can differ from one service to another.

Check next:

• Which authentication methods are actually shown on this service?
• Do you already have one of those credentials?
• Does that provider support your current eligibility and record?

Do not assume that every public-service site offers the same Any-ID methods or that every method is available to every foreign resident.

If the screen asks for mobile ID

A mobile foreign resident ID is an official current credential available to registered foreigners under current guidance.

But having one does not mean every website or service accepts it.

Check next:

• Does the current service explicitly offer mobile ID?
• Is the mobile foreign resident ID one of the accepted credentials?
• If not, use another officially offered method or the service’s support channel.

If this is a bank or account-opening screen

Treat this as a separate branch.

Bank and financial onboarding can use financial real-name verification, which is not the same as ordinary web 본인인증.

Result: Financial real-name verification branch.

Check next:

Use the bank’s current official instructions for foreign-resident identity documents, mobile ID, non-face-to-face verification, and account-opening eligibility.

Do not reuse generic website identity-verification troubleshooting as if it were a bank rule.

If the information appears not to match

A record mismatch is a legitimate possible cause, but the relevant record depends on the branch.

The authoritative record could be held by:

• a mobile carrier
• a certificate issuer
• an immigration system
• the service itself
• a bank or financial institution

Identify which record is being checked rather than entering the sensitive data itself.

Avoid advice such as:

• change the spelling until it works
• remove or add a hyphen
• reverse the name order
• try another person’s phone number
• use another person’s account or identity information

If the record appears wrong, confirm or correct it through the relevant official provider.

If the error is unclear

Result: Cannot determine.

Check:

1. What kind of verification screen is this?
2. What information does it ask for?
3. Which credential or account are you trying to use?
4. Is the mobile line, certificate, ID, or account actually yours?
5. What exact error message does the service show?

Then use the official support channel for the service, carrier, authentication provider, immigration service, or bank involved.

Stop rather than inventing a cause when the available information is not enough.

Why Korean identity verification can feel confusing

Korean online identity verification is not one single system.

Different services may use:

• mobile-phone identity verification
• i-PIN
• certificates
• Any-ID or other public-service authentication
• mobile ID
• service-specific identity checks
• financial real-name verification

A foreign-registration number or passport number can be information requested within one of those flows, but it is not automatically a universal standalone verification method.

That is why the starting point is:

What kind of screen is this?

What this troubleshooter does not do

This tool does not:

• collect actual foreign-registration numbers
• collect passport numbers
• collect bank-account numbers
• collect certificate identifiers
• collect verification codes
• collect passwords or PINs
• collect biometric information
• suggest another person’s phone number, account, or identity
• suggest false information
• suggest bypassing age, eligibility, or security checks
• promise that a fix will work
• claim an exact cause without provider evidence

Its job is narrower:

screen type → credential/state → error type → likely issue category → official next check