If a lock screen is set up with a pattern, PIN, or password, the fingerprint sensor can also be used to unlock the Samsung device. Multiple fingerprints can be added.

This guide shows how to enable fingerprint unlock if a fingerprint has already been registered, but if no fingerprint has been registered yet, the machine will request one.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Tap on  Screen lock type
Step 4:  Enter your Lock screen  Password / PIN / Pattern
Step 5:  Enable or disable  Fingerprints
Step 6:  If no fingerprint is registered yet, follow the instructions on the screen
  1. Open the Settings
  2. Tap on Lock screen
  3. Tap on Screen lock type
  4. Enter your Lock screen Password/PIN/Pattern
  5. Enable or disable Fingerprints
  6. If no fingerprint is registered yet, follow the instructions on the screen

Samsung Instructions
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