Hi!
First, it is important to know exactly what the code is. What specific error message appears on the lock screen? Please take a photo and attach it to the thread (be sure to remove any personal information).
It is also important to know:
- Has the laptop undergone any maintenance or had any parts replaced recently?
- Have there been any changes to security information, passwords, or other account details?
- Did the problem occur after an update or the installation of an app?