Multiple Parents does not work with ScreenTime API iOS

I am developing a parent child control app using Screen time API and Family Control. I created two apps, one for parent and another for child. I want to see child device's activity report on parent app. This functionality works when there is only one parent/organiser. I am trying to add multiple parents to access device activity report using screen time API. I created a family group where I am the organiser (Dad), added another account as parent (Mom) and two child accounts. On the child's device I installed the app, authorised the app for parental approval (Dad) and screen time restrictions. When using the parent app as Mom, I am unable to fetch the child device's activity report.