Issues with Family Sharing
Hi there... can anyone perhaps help me with one or two things regarding Family Sharing which I simply cannot seem to get right?
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You are welcome. Each family member should have their own Apple ID. Apple IDs aren't meant to be shared.
If you and your wife are using the same Apple ID, that will cause the error when you are seeing when she changes the name of her device. If you are sharing an ID, create a new ID for her.
When changing to the new ID, there may be some data loss, but you can minimize it. If syncing photos with iCloud, ensure Optimization is turned off in Settings/Your Name/iCloud/Photos and/or in Photos/Preferences/iCloud. Then make sure full resolution photos are on the device/computer. When signing out of iCloud, if asked whether you want to retain data, choose yes. Messages conversations will be lost if they are addressed to the ID. See the article below for other places that the old ID should be removed. See Winston Churchill's response in the below discussion.
How to transfer all files from one iCloud account to another
Apple ID email address or password - What to do after you change