I accidentally Deleted fingerprint on my phone how can I how can I re-activate fingerprint pass code on my iPhone 6

Follow all the steps provided in this support article:--> If Touch ID isn't working on your iPhone or iPad – Apple Support

If the issue still persists, contact Apple Support directly, using this link:--> Get Support

Regards

Giulio

In Settings>Touch ID & Passcode:

• Remove the existing passcode.
• Input a new passcode.
• Input new fingerprint(s)
• Restart your device

Regards

Giulio