Use a different Apple ID with Media & Purchases
In iOS, Settings, Apple ID, Media & Purchases, View Account the current user sign-in works fine.
In iOS, Settings, Mail, Accounts, iCloud, Media & Purchases, the current user is asked to "Set up Media & Purchases", and then "Continue" sign-in fails every time.
Is there an explanation for failure to sign-in?
iPhone SE, iOS 16