How to Fix Face ID Not Working on iPhone

Is your iPhone 17 or 16 showing the "Face ID Not Available" error after the January 2026 updates? In iOS 26.2, Apple has introduced stricter "TrueDepth Handshake" protocols that can disable Face ID due to minor sensor obstructions or the new Stolen Device Protection locks. Whether your Face ID stopped working after a software update or your "Reset Face ID" button is greyed out, this updated tutorial covers the "Clean & Trust" method, the "Diagnostic Mode" trigger, and the 2026 "Alternate Appearance" recalibration. In this video, we cover: The "Clean & Trust" Method: Why iOS 26 is more sensitive to microscopic dust—how to properly clean the sensor notch or "pill" cutout to fix intermittent failures. The iOS 26.2 Reset Trick: How to navigate to Settings - Face ID & Passcode to perform a "hard reset" of your facial data and why you must toggle off Stolen Device Protection first. Fixing "Face ID Not Available": What to do if the system says Face ID is disabled—using the 2026 "Force Restart" sequence to re-initialize the infrared dot projector. The 2026 Diagnostic Mode: A pro tip—how to boot your iPhone into Diagnostic Mode to run a remote hardware test on the TrueDepth camera before booking a Genius Bar appointment. Alternative Appearance Setup: How to add an "Alternate Appearance" to account for 2026 style changes like new glasses, facial hair, or the latest tactical masks. Screen Protector Conflicts: Why some iPhone 17 "Liquid Glass" screen protectors are causing refraction errors and how to check if yours is misaligned.