This issue has been resolved in the latest phone software version. Please restart your phone and update to the latest version to try again.
If this issue persists after the upgrade, please refer to the following methods:
1. Please move your fingers when registering and do not press the same position;
2. Ensure that your finger is placed correctly on the fingerprint sensor;
3. Please keep your fingers and the surface of the phone clean when unlocking;
4. Try to use official screen protectors, as unofficial ones will affect the unlock performance.