iPad2 Yahoo Mail Broken
iPad2 with Yahoo mail account for many years stopped working this morning.
Login to account rejected password.
Used Safari to access Yahoo mail, same account, same password, no problem.
Deleted Yahoo mail account from iPad.
Attempted to "Add Account", Yahoo, goes through mail address and password, circles for a while, then returns to "Add Account" without adding the account.
Attempted to add Yahoo Mail app, says need iOS 10.0 or later.
iPad2 has iOS 9.3.5, and attempt to update reports already "up to date".
What is broken?
iPad 2 Wi-Fi, iOS 9.3.5