Employees can mark attendance only when their phone's GPS puts them at their assigned work site. Try it yourself: this demo uses sample data only.
Your work site will be set to where you are right now, so Check In works for you. Test accounts are deleted after 24 hours.
Allow location when asked. Your phone's current position becomes your work site (150 m circle).
Log in to mark your attendance.
Create the admin account. Only you will see this screen, and only once.