Congrats on the new phone, dyh888. There's no known issue, so that's good. Is this function completely absent or is this an intermittent issue? Have you attempted to delete & retest?
There are known issues with optical in-screen fingerprint sensors. Not all screen protectors are compatible with optical in-screen fingerprint sensors. If you have a screen protector on try removing it > delete your fingerprints > and try adding them again.