most Samsung devices (with the exception of the cheapest entry-level devices) have a fingerprint sensor built in that can be used to unlock the device. setting up the display lock with fingerprint always requires a secondary lock such as a PIN, password or pattern. even if these are hardly ever or never used, they should be well remembered. if the fingerprint cannot be scanned or the security settings need to be changed, the PIN/password/pattern is required. any finger can be used to set up the fingerprint.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Biometrics and security
Step 3:  Tap on  Fingerprints
Step 4:  Enter  PIN / Password / Pattern
Step 5:  Confirm with  Ok
Step 6:  Press your finger on the  sensor
Step 7:  Choose between  Add  and  Done
  1. Open the Settings
  2. Tap on Biometrics and security
  3. Tap on Fingerprints
  4. Enter PIN/Password/Pattern
  5. Confirm with Ok
  6. Press your finger on the sensor
  7. Choose between Add and Done

Samsung Instructions
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