I've located the problems...but I still don't know how to fix it. My child's apple watch is not signed in. The @iCloud address is correct and is listed on the family sharing plan. The watch settings list his correct Apple ID and correctly list it as paired with my phone/account. His Apple ID is listed as being able to participate in purchase sharing, and his watch is using his Apple ID. All of this was done in the steps to set up the watch, but the App Store still says that the watch is not signed in. How do I sign this watch in?