
If you use the fingerprint sensor to switch the display on immediately, it will not work until it is locked. It could be set to a few seconds, a minute, or more based on personal preference. However, there is a delayed interval before it is locked. When you use the power button to turn off your display, you often assume that the phone is instantly locked. Once you reach this stage, choose Instantly with Power Key or When Screen Times Out.Please open it and find the secure lock settings page.Scroll to find lock screen and security.

Tap to open the Settings menu on your Galaxy S9 phone.Based on a user comment posted in the Samsung support forum, it looks like you could solve it by tweaking the secured lock time in the settings menu. Most phones don’t have a hardware issue as most users opine and try to exchange their phones immediately. See also: How to fix Samsung Galaxy S9 Wi-Fi Issues Fingerprint scanner not working on Galaxy S9 – Here’s how to fix it Method 1: Change the Secured Lock Time in Settings
