What the PIN security warning on Windows means
If you are seeing a PIN security warning on Windows, the system is usually telling you that Windows Hello, your Microsoft account, or a device security setting needs attention.
This article explains how to fix PIN security warning on Windows and why the warning appears in the first place, so you can restore sign-in access without guessing.
The message is often tied to a broken PIN credential, a change in account status, a TPM issue, or an update that disrupted Windows Hello.
The good news is that most cases can be resolved with account verification, a PIN reset, or a quick security settings repair.
Why Windows shows a PIN security warning
Windows uses a PIN through Windows Hello as a device-bound sign-in method.
Unlike a password, the PIN is protected by the Trusted Platform Module (TPM) when available, which is why Windows may warn you when the local security environment changes.
- Windows Hello PIN data is corrupted after a failed update or profile issue.
- Microsoft account verification is incomplete or the account password recently changed.
- TPM or Secure Boot settings changed in BIOS or UEFI.
- Group Policy or enterprise controls restrict PIN usage.
- Windows Defender or third-party security tools interfere with credential storage.
- System time or device registration errors affect authentication.
How to fix PIN security warning on Windows
1. Sign in with your password first
If Windows still offers password sign-in, use it instead of the PIN.
This confirms your account is active and lets you troubleshoot from inside the desktop environment.
For Microsoft accounts, make sure you know the current password before changing any sign-in settings.
2. Reset the PIN in Windows Hello
The most direct fix is to remove and recreate the PIN.
Go to Settings > Accounts > Sign-in options > PIN (Windows Hello), then select I forgot my PIN or Remove if that option is available.
Recreate the PIN after verifying your identity.
If the warning is caused by a stale credential entry, resetting the PIN usually clears it immediately.
Use a strong PIN that is not easy to guess, and avoid simple patterns such as 1234 or repeated digits.
3. Verify your Microsoft account
Open your Microsoft account security page and check for alerts, recent password changes, or required verification steps.
If you changed your account password from another device, Windows may require you to sign in again and refresh your local credentials.
- Confirm your email and phone recovery methods are current.
- Approve any security prompts tied to two-factor authentication.
- Check whether the account was temporarily locked or flagged for unusual activity.
4. Restart the device and install pending updates
A restart can clear temporary credential glitches, especially after an update.
Then go to Settings > Windows Update and install all pending updates, including optional driver updates if available.
Windows Hello depends on multiple components, including system services, security framework updates, and chipset support.
A patch from Microsoft may already address the warning.
5. Check the TPM status
Because many Windows Hello PINs are tied to the TPM, a TPM error can trigger security warnings.
Open tpm.msc from the Run dialog and check whether the TPM is ready.
- If the TPM is disabled, enable it in BIOS or UEFI.
- If the TPM shows an error, follow your device maker’s recovery guidance.
- Do not clear the TPM unless you understand the impact on BitLocker and other protected credentials.
6. Review Secure Boot and BIOS changes
If you recently changed firmware settings, restored BIOS defaults, or updated UEFI, Windows Hello may detect a trusted hardware change.
Re-enable Secure Boot if it was turned off, confirm the TPM remains active, and boot back into Windows to test the PIN again.
OEM systems from Dell, HP, Lenovo, and Surface devices may label these options differently, but the goal is the same: restore the device security baseline that Windows expected.
7. Create a new local Windows Hello credential
If the warning persists, remove the current PIN and create a fresh one after rebooting.
Some users also benefit from temporarily switching to a local account, then back to a Microsoft account, which can refresh broken identity data.
For work-managed PCs, you may need to contact your IT administrator if the policy controls Windows Hello for Business.
In that case, the warning can be tied to organization-wide authentication settings rather than your personal device alone.
Advanced fixes when the warning won’t go away
Delete the Ngc folder carefully
On some systems, the PIN container stored in the Ngc folder becomes corrupted.
Deleting or renaming that folder can force Windows to rebuild Windows Hello data, but it requires administrator access and careful handling.
This method is best used only if the normal PIN reset fails.
Before proceeding, ensure you can sign in with your password and that you understand the impact on all Hello-based sign-in methods on the device.
Run system file checks
Corrupted system files can interfere with credential services.
Open an elevated Command Prompt and run:
sfc /scannowDISM /Online /Cleanup-Image /RestoreHealth
These tools repair Windows components that may be affecting sign-in behavior, especially after failed updates or disk issues.
Check Group Policy and security software
In enterprise environments, Group Policy can disable PIN sign-in or force a different credential flow.
Security suites, endpoint protection tools, and device compliance platforms may also block or reset authentication data.
- Review local policy settings for Windows Hello or convenience PIN restrictions.
- Temporarily test with third-party security software paused, if your organization allows it.
- Ask IT whether your device is enrolled in Azure AD, Intune, or another management platform that controls sign-in policy.
How to prevent PIN security warnings in the future
After you learn how to fix PIN security warning on Windows, the next step is reducing the chance of recurrence.
A few habits can make Windows Hello much more stable.
- Keep Windows and device drivers updated.
- Use a consistent Microsoft account password and update recovery options.
- Avoid unnecessary BIOS or TPM changes.
- Use a reliable power source during updates so the system does not shut down mid-install.
- Keep BitLocker recovery keys saved securely in case firmware or TPM settings change.
- Restart the PC after major security updates so credential services refresh properly.
When to use password sign-in instead of PIN
If the PIN keeps failing but your password works, Windows may need more time or a deeper repair before Hello is trustworthy again.
Password sign-in is a useful fallback while you troubleshoot, especially on shared or work-managed devices.
Use the password route if the account verification is still pending, the TPM is unstable, or you need to change account recovery settings before recreating the PIN.
Once the underlying issue is corrected, you can re-enable the PIN and return to faster sign-in.
Common questions about PIN security warnings
Is a PIN less secure than a password?
On Windows, a PIN is usually device-specific and protected by the TPM, which makes it different from a password.
A well-protected PIN can be secure, especially because it does not directly expose your Microsoft account password.
Will removing the PIN delete my files?
No.
Removing a Windows Hello PIN does not delete personal files, but it can require you to sign in again and recreate your credential.
Always save your work before making security changes.
Can a Windows update cause the warning?
Yes.
Updates can change system files, security services, or driver behavior, which may disrupt Windows Hello and prompt a PIN security warning until the credential is reset.
What if my device is managed by my employer?
If your device uses domain, Azure AD, or Intune management, the warning may be controlled by company policy.
Your IT team may need to reapply the correct Windows Hello policy or repair the device registration.