Apple ID
My Apple ID keeps coming up on my wife’s iPhone and asking for a password. Why?
iPhone 11 Pro, iOS 13
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Best reply
Check the App Store and iTunes Store to see if there are any updates for apps/purchases. A request for another Apple ID password is often caused by updates to apps/purchases that were made when using the other ID. Those purchases are tied to the other ID and can't be transferred. One option is to delete the apps/purchases made by the other ID and download them using the new ID if desired. If necessary, check your purchases history to see which apps/purchases weren’t made by the current ID.
Or you can try to set up Family Sharing to keep access to your purchases.