Why do I need to verify the lock screen password after 72 hours of not using it?

This is the security mechanism of the Android system. To further ensure the security of your phone information and make it easier to remember the lock screen password, this mechanism has been added to ColorOS 6 and above versions. When you have enabled the lock screen password and biometric password (face or fingerprint) at the same time, and you have not entered the lock screen password for 72 consecutive hours, you need to verify the lock screen password. After that, you can use it normally.