My ipad mini touch ID will not recognize my fingerprints.

These may help you:

• A clean Touch ID sensor can read your fingerprint more easily. Use a clean, lint-free cloth to wipe off any dirt or debris from the Home button.
• Press slightly longer for Touch ID to recognize your finger.
• If you have trouble enrolling one finger, try enrolling a different finger. Touch ID works only for fingers that you enrolled. You can enroll up to five fingers using Settings > Touch ID & Passcode.

I've found that if the finger I use for scanner is damp then the scan doesn't register. Make sure finger/thumb isn't sweatty or damp.