Why wont facebook let me log in?

[the bro code]

It happens when someone reports you (actually it takes more than just one).
Also it can happen if you logged in using some application (like some 3rd party messenger) other than the default Facebook app (i mean on your phone).
If the problem is being encountered on your phone try logging in from a desktop.
Maybe you told the Email and password to some friend who kinda lives away, so facebook takes the log in from some place away from where you first logged in, or usually log in, as a hacking attempt and locks your account despite you entering a correct password.
Try adding a link of the screenshot of the message if the problem is on the desktop and i'll help you.