Family Sharing Screen Time Parent unable to see all child devices

I am the organizer of the Family Sharing on our Apple devices. I have previously and successfully set up screen time management for my child, which include two devices - his iPhone and his iPad. I can manage screen time requests from both devices. I can also see the activity of both devices. That part is working fine. However, I added my wife as a Parent/Guardian to Family Sharing. She gets screen time requests only from the child's iPad device and can only see activity from the iPad device, but she is not receiving screen time requests from the child's iPhone, nor can she see activity of that iPhone. Any ideas why she can see/manage one device but not the other, even though I can see and manage both?