Unable to apply lock screen custom wallpaper

Hi

We are trying to apply custom wallpaper for windows lock screen but we tried all the combinations and configurations it did not work even though the group policy applied on the end-user system. We are using the below client-server versions.

Windows10 Version-  1809 (OS Build 17763.107)

Windows Server 2012 - Version 6.3 (Build 9600)

Is lock screen wallpaper change option is not available for latest Windows 10 versions? if so which versions do we need to users on server and client machines?

Could someone prefer exact deployment method for lock screen deployment using Group Policy?

Let me know if you need any additional info.

Regards

Nagaraju Chengeli