Not sure if this affects the app but it will with web.
In Safari 13 and iOS13 - "...when a user signs into a website and Safari notices that the password they just used was weak, Safari will prompt the user to go and visit the website to change the password. If the user accepts Safari's offer, they'll be taken over to Settings where they can change their password."
Need to add a redirect to our change password screen on the server at ".../.well-known/change-password", then the user will be taken directly to the change password screen.
https://developer.apple.com/videos/play/wwdc2019/516/?time=622