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 changed my device and all the accounts, GitHub, Heroku are not on my authenticator app again. Now I can't access my Heroku account dashboard. And I really need to work on a server hosted there.
If you have changed your device, you will need to set up your authenticator app again and re-add your accounts.