Latitude 5400, supports Windows Hello Face feature?

Hi @hammad453 have you first checked to see if your device works with Windows Hello?

Go to Windows Settings (or simply type Windows key + i ) > select Accounts > Sign-in options > Windows Hello

If you rather some pictures on how to do so, click on the Start Menu

After that click on "Accounts" then look for the "Sign-in options"

From there you will see different " Ways to sign in "

The image below is a picture of my settings. Its unavailable to me because I'm using a work computer, and this is something that is managed by my organization. For you it may or may not be different. 

If your computer is able, you should be able to click on "Set up" and that will let you know. As seen below

Based on my knowledge as long as your computer has a functioning camera. Windows Hello should work for you. The Latitude while not new is still a fairly modern laptop that has a camera though there are some modules that don't.  Please report back and let us know.