How to Fix iPhone Propblem Unable To Activate Touch ID

Unable To Activate Touch ID on this iPhone

If Touch ID isn't working on your iPhone or iPad
If you can't unlock your iOS device using Touch ID, can't enroll a fingerprint, or you're asked to enter your passcode, learn what to do.
Where is the Touch ID sensor?
The Touch ID sensor is either in the Home button or—on iPad Air (4th generation)—the top button. When you follow the steps below, the onscreen instructions will tell you which button to use.

Follow these steps. Try using Touch ID after each step:

  1. Make sure that you have the latest version of iOS or iPadOS.
  2. Make sure that your fingers and the Touch ID sensor are clean and dry.* For the Touch ID sensor, use a clean, lint-free cloth to wipe off any dirt or debris.
  3. Your finger should cover the Touch ID sensor completely, touching the surrounding metal ring. While Touch ID is scanning, you shouldn't tap too quickly or move your finger around.
  4. If you're using a case or screen protector, make sure it doesn't cover the Touch ID sensor or the surrounding ring.
  5. Go to Settings > Touch ID & Passcode and make sure that iPhone Unlock or iTunes & App Store is on, and that you've enrolled one or more fingerprints.
  6. Try enrolling a different finger.

Still Showing Same Problem

If the previous steps didn't help, you see "Failed—unable to complete Touch ID setup", or either of the following happen when you go to Settings > Touch ID & Passcode, take your device to an Apple Retail Store or Apple Authorized Service Provider, or contact Apple Support:

  • You can't turn on Touch ID
  • Touch ID is dimmed or grayed out

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