Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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I have just changed iPhones and when I went to use Authenticator it asked for my MS Password, however, it then repeatedly rejected it. I tested this password via a browser and it was OK. After changing password in Authenticator, it let me in, however, none of my records were listed and I am now locked out of multiple sites for which I use 2FA