The app is called Microsoft Authenticator in the store , but on my icons , it's only says authenticator. Google has an Aut.. app as well do others, if the icon said Microsoft Aut.. then, I know I can trust it. It has lot's of verify methods, so many, that you don't get the same option twice , as a way to log into an account, if you have no account linked sometimes when you load it up there'll be an option to scan a QR code, 2 link an account, then option is gone. Random # code don't always work.