Parental Controls Not Working: Child can text/call/facetime unapproved contacts
I have two kids, each have our old phones to play around with. Each of the phones have parental controls set up the same. One child's phone only allows him to contact people in his contact list that I have set up. The other child can type in any number he wants and in turn, isn't blocked from contacting people outside of the contact list I have set up.
I have reset the phone, I have deleted everything and started over again so many times. Why are these phones set up the exact same way but one is working as intended while the other does not?
Not sure if it helps but the one working is an iPhone 8; one not working correctly is iPhone 6. Both are up to date of software.
Please help before I've pulled out every strand of hair I have left!
iPhone 6, iOS 12