Face ID can fail for very different reasons, but you can usually tell whether the problem is recognition, settings, or the TrueDepth camera without working through a long list of fixes.
Start with one quick test.
Open:
Settings > Face ID & Passcode
Enter your passcode and tap Set Up an Alternate Appearance if that option is available.
You do not have to complete the setup yet. The important question is whether the TrueDepth system can detect your face and begin scanning normally.
If the camera immediately recognizes your face and starts the scan, the Face ID hardware is at least communicating. Poor recognition, appearance, attention settings, or an app-specific permission becomes more likely.
If setup repeatedly says Face ID is unavailable, cannot detect your face with a clear view, or cannot complete the scan, hardware deserves much more attention, especially after a drop or repair.
Before deciding, run through the checks below.
Start with the part Face ID actually sees
Face ID does not rely on the ordinary selfie camera alone. Apple’s TrueDepth system uses infrared components to map facial depth.
That is why a front camera that takes perfectly good selfies does not prove Face ID hardware is healthy.
Wipe the notch or Dynamic Island area with a clean, soft, lint-free cloth.
Then remove anything that might overlap the sensor area for one test:
- Screen protector
- Privacy protector
- Camera cover
- Poorly fitted case
Hold the iPhone naturally, roughly 25 to 50 cm (10 to 20 inches) from your face.
Your eyes, nose, and mouth should be visible for normal Face ID. Hair, a scarf, a high mask, a hand, or some sunglasses can interfere.
Now lock the phone and try again.
If Face ID immediately improves, you have found a recognition problem rather than an iOS failure.
The iPhone asks for the passcode even though Face ID normally works
This is often normal.
Apple deliberately disables biometric unlocking temporarily after certain security events.
For example, the passcode is required after the iPhone restarts, after five unsuccessful Face ID attempts, after certain periods without biometric/passcode authentication, after a remote lock, and after initiating Emergency SOS/power-off with the hardware buttons.
Enter the passcode once, lock the iPhone, and test Face ID again.
When it works on the next normal unlock, there is nothing to repair.
This distinction also matters with Stolen Device Protection. Some protected actions can require successful Face ID with no passcode fallback, and some security changes can trigger a Security Delay. A passcode working for normal unlocking does not necessarily mean it can substitute for Face ID during one of those protected actions.
Face ID unlocks the iPhone but fails in an app
Leave the facial scan alone.
A successful iPhone unlock proves Face ID can recognize you.
Instead, open:
Settings > Face ID & Passcode
Check the options under Use Face ID For.
Make sure the feature you need is enabled. Depending on the iPhone and iOS version, this can include unlocking, purchases, Wallet/Apple Pay, Password AutoFill, and third-party apps.
For a third-party app, also check the app’s own security settings. Banking, password-manager, and authentication apps often require you to re-enable biometric login after an update, password change, sign-out, or security event.
A failure isolated to one app is not a good reason to reset Face ID for the entire phone.
Face ID works badly only with glasses, sunglasses, or a mask
Test with nothing covering your face first.
If recognition becomes reliable, the TrueDepth system has given you useful evidence.
Many ordinary glasses and sunglasses work with Face ID, but Apple notes that some sunglasses block the infrared light the TrueDepth camera needs.
For masks, the rules are more specific.
Face ID with a Mask is available on supported iPhone 12 and later models. Apple says the feature relies on characteristics around the eyes, so the eyes must remain unobstructed.
You can configure it under:
Settings > Face ID & Passcode > Face ID with a Mask
You do not need to wear the mask during enrollment.
If you wear glasses with a mask, use Add Glasses in the same Face ID settings. Apple allows multiple pairs to be registered.
Face ID with a Mask is not designed to work with sunglasses and does not work in landscape orientation.
That is a feature limitation, not a damaged sensor.
Landscape works on some iPhones, not all
An older Face ID iPhone can appear broken simply because you are testing it sideways.
Apple supports Face ID in both portrait and landscape orientation on iPhone 13 models and later running iOS 16 or later.
Earlier Face ID iPhones require portrait orientation.
Rotate an older model upright and face the TrueDepth camera directly before troubleshooting anything else.
Recognition became unreliable after your appearance changed
Face ID normally adapts gradually as your appearance changes.
A much larger difference can justify an Alternate Appearance.
Go to:
Settings > Face ID & Passcode > Set Up an Alternate Appearance
This can be useful when your regular appearance genuinely varies in a significant way.
Do not use Alternate Appearance as the first response to a sensor that suddenly cannot recognize any face. If setup itself fails, the problem is deeper than an outdated facial scan.
Attention can explain a very specific failure
By default, Face ID is attention-aware. It normally expects your eyes to be open and directed toward the iPhone.
This increases security.
Apple provides the control under:
Settings > Accessibility > Face ID & Attention
You can temporarily test Require Attention for Face ID when an accessibility need or eye-tracking issue appears to be involved.
I would not switch it off merely to make Face ID easier to trigger. Apple notes that requiring attention makes Face ID more secure.
Attention settings also cannot repair a TrueDepth system that fails during Face ID setup.
When resetting Face ID is worth doing
Reset the facial scan when Face ID hardware appears to work but recognition remains consistently poor after cleaning the camera area, checking positioning, restarting, and updating iOS.
Go to:
Settings > Face ID & Passcode > Reset Face ID
Then choose Set Up Face ID and enroll again.
Use a clear face for the standard setup and hold the iPhone in portrait orientation during enrollment.
Resetting Face ID removes the stored facial representation. It does not erase photos, apps, messages, or other personal data.
The important part comes next: can the iPhone complete the new Face ID enrollment?
If yes, test normal unlocking before changing anything else.
If no, stop repeating the reset.
A failed setup after a repair is a different problem
Suppose Face ID worked normally, the iPhone had a display or front-camera repair, and Face ID stopped immediately afterward.
That timeline is stronger evidence than any generic software fix.
The TrueDepth system contains security-sensitive components. Apple warns that improper repair or modification of the laser system can prevent its safety mechanisms from functioning correctly.
Return to the repair provider and explain that Face ID failed immediately after the work.
Do not install random replacement sensor assemblies or attempt to modify the TrueDepth hardware yourself.
A similar boundary applies after a hard drop or liquid exposure. When Face ID setup cannot complete after a physical event, professional inspection makes more sense than resetting every iPhone setting.
What a working selfie camera proves, and what it does not
Open Camera and switch to the front-facing camera.
A completely dead front camera obviously strengthens the hardware case.
But a working selfie camera only proves that the visible-light camera can capture an image. Face ID also depends on other TrueDepth components.
So this result:
Selfies work + Face ID setup fails repeatedly
does not clear the hardware.
It is entirely possible for normal front-camera photography to work while Face ID remains unavailable.
Restart and update, but keep them in perspective
For a Face ID problem that appeared without physical damage, restart the iPhone.
After every restart, iOS requires the passcode once before Face ID becomes available again.
Then check:
Settings > General > Software Update
Install the current compatible iOS version.
These are worthwhile software checks. They are not substitutes for hardware diagnosis when Face ID died immediately after a screen repair, impact, or liquid exposure.
I also would not erase the iPhone as a routine Face ID fix. A factory reset creates substantial work and cannot repair a damaged TrueDepth component.
When Apple service becomes the sensible next step
The most useful boundary is whether Face ID can still be configured.
Apple recommends service when the camera is not working and Face ID cannot be set up.
I would move toward service when:
- Face ID setup repeatedly cannot complete with a clear, unobstructed face.
- iOS reports that Face ID is unavailable.
- Face ID stopped after a display/front-camera repair.
- The problem began after a significant drop or liquid exposure.
- The TrueDepth/front-camera area is visibly damaged.
- Restarting, updating, and resetting Face ID do not restore enrollment.
When Face ID still recognizes you for normal unlocking but fails in one app, one orientation, or with one pair of sunglasses, the evidence points elsewhere.
That is why the enrollment test is useful: it separates a TrueDepth system that can still scan a face from a problem that is more likely to need hardware attention.
For Home-button iPhones, Face ID is not the relevant biometric system. Use Touch ID Not Working on iPhone instead.
