When you install a profile on an Apple device you need to set up a passcode if you don’t already have one set up. Once set up there will be a passcode on the device to unlock it, this is something that we had to do in order to get Screen Time to block apps on Apple devices.
Summary
Article Name
Why is there a passcode on my child's device after installing?
Description
When you install a profile on an Apple device you need to set up a passcode if you don't already have one set up.