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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When trying to add multiple accounts on authenticator for production, test and development environments, authenticator warns it will overwrite the previous as it has the same username - There is a workaround to use the secret key however this is not suitable for the wider user-base.
Android does not have the same issue, neither does other authenticator Apps.