Reinstalling does not have to mean a new profile
If the child’s profile already exists, start from that profile when setting up again. Generate a new pairing code rather than creating another child with the same name.
After pairing, check the device name and saved rules. With several phones, it is easy to inspect the usage of a different device from the one being tested.
How to check the completed setup
Open the selected app on the child’s phone, apply a rule from the parent’s phone and check the effect after synchronization. Change the rule again to test restoring access too.
Then set school and night schedules. Explain which apps have limits, when blocks apply and how to ask for extra time. You do not need to read the child’s messages to agree on these rules.