iPhone keeps asking for ex's ID from cancelled Family Sharing
Every time I update and restart my iPhone it asks for my ex's Apple ID login, and also my old Apple ID.
I removed him and cancelled Family Sharing over a year ago, on a different phone. I've also reassigned my iTunes, iCloud and Apple ID to my new email address, but the old one keeps showing up in alerts. I can choose to ignore or "Cancel" the alert and I'm still logged in correctly with my current Apple ID, but it's really annoying to have to close so many windows every time I restart my phone (plus I really don't want to see his ID any more).
Neither my ex's nor my old email address show up on any of the account setting screens, they only ever show up as alerts asking for passwords when my phone restarts. How do I delete these old logins?
iPhone X, iOS 12.1, This issue was also on my old 6S