scheduled downtime keeps switching off
Hi have set up family sharing for my two sons with their iphones. Under screentime on my phone I have scheduled downtime limits for both of them so that they're mot on their phones all the time.
The scheduled of time limits I have created won't remain switched on. The schedule just switches off each time allowing my son to have 24 hour access to his phone. I go back into 'downtime' and enable it but when I look at it again it's off.
How do I resolve this please.
iPhone XR, iOS 15