When creating companionships for both ministering sisters and brothers, LCR doesn't seem to allow for YW and YM over 14 to be added as companions. I called support and they were also stumped. Does anyone know how to make this work?
If you go to Organizations > Ministering > Relief Society in LCR, there is a blue background note just under the menu that says, among other things, that the ability to assign Mia Maids and Laurels as Ministering Sisters will be added in August.