Possibly stumbled on a solution.Set up Face ID while logging in to a iMessage chat with T-Mobile support. Next time opening app, Face ID logs in and everything works fine.
iPhone 15, reinstalled, cleared cache, nothing. This second level sign in to the bill freezes upon entering anything in the password field. No VPN, on T-Mobile cellular data. Odd, and a fairly recent development in the past month or two.
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