How can I download a new app without my old email address popping up?
Hiw do I update to my new email address when downloading a new app?
Question marked as
Which ID is logged into the App Store/iTunes?
A request for an old Apple ID password is often caused by updates to apps/purchases that were made when using the old ID. Those purchases are tied to the old ID and can't be transferred. One option is to delete the apps/purchases made by the old ID and download them using the new ID if desired. Or you can try to set up Family Sharing to keep access to your purchases.
Family Sharing - Use your own Apple ID for Family Sharing
Family Sharing -What types of content can I share?
Family Sharing - If you don‘t see your family‘s shared content
Family Sharing - purchases and payments
Family Sharing - Hide and unhide music, movies, TV shows, audiobooks, and books