I fixed it.
WARNING, if you are running iOS 9 b3 and don't have a Mac or other Apple device that can be used (I found OS X 10.11 b3 ok) you may not be able too complete the following. You have been warned.
Anyone who can't get another family member setup on Apple Music, using with Family Sharing, just remove and add that member again. Something must have gone wrong with my Wife's account when I first set it up.
As I stated in the WARNING above, iOS 9 beta might fail to allow the family member to be added again. I kept getting a server error. Thankfully I was able to re-add my wife via my MacBook, even though it was running El Capitan b3. I could have used one of the other Apple devices in the house, but that would have required me to log in on one of them using my Apple account and that was just too much hard work.
07-15-2015 11:07 PM