Touch ID not working on my iPad

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• Use Touch ID on iPhone and iPad - Apple Support
•  If Touch ID isn't working on your iPhone or iPad - Apple Support

Some users just have difficulty using TouchID. The causes for of TouchID being unreliable for some users - and not others - are many. Whilst not an exhaustive list, possibilities include:

• Very high humidity (“sweaty” fingers)
• Very low humidity (excessively dry skin)
• Poor fingerprint ridge-detail (excessive hand washing - or exposure to abrasive material, damaging fingerprint detail)
• Physical injury (cuts or splits to the fingertip)

If you have naturally dry skin, try using a “light” (non greasy) and easily absorbed skin moisturiser.

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.

If it does not work, look here: If Touch ID isn't working on your iPhone or iPad - Apple Support