Hello, and Welcome
Have you tried rebooting the computer and trying your 4 digit pin? I am not familiar with Samsung but does it have a fn key that would be similiar to a numlock key. Make sure that is not pressed or active.
If that does not work then at the login screen press Ctrl+Alt+Del twice. This should bring up a login box. Type your user name and password pin. If that does not work then use administrator for a user name and leave the password blank.
If using Administrator for a user name does not work you will need to enable the hidden Administrator Account. You will need to disable SecureBoot in UEFI and also Fastboot/Quickboot if enabled. If the disk does not boot you may need to change to Legacy Boot. Do you have a model number of the Samsung?
Here is a guide on using the software to enable the hidden Administrator Account. You can download the latest version here. Burn the iso file to disk. You can also use the iso with Rufus to create a bootable USB flash drive if you do not have a disk.