Sign in in authenticator app is not working

Hi @Devayani Kulkarni

Regarding your issue, may I kindly ask if you have other admin with at least authentication administrator role in your organization? If yes, you can ask them to either unblock your account or reset your multi-factor authentication (MFA) for you.    

They can follow these steps:   

1. Sign in to the entra.microsoft.com as at least Authentication Administrator.   
2. Select User -> All user.   Select the user (your account) to act on and select Authentication methods. then select Require re-register of multi-factor authentication.    

• Require re-register MFA: This disables all previous authentication methods. You'll then be prompted to configure a new MFA authentication method the next time you try to sign in, so you can set up from the start and add a new authenticator app.   

For more details, please refer to: Manage user authentication methods for Microsoft Entra multifactor authentication. 

Note: Once re-registration is triggered, all your existing MFA methods such as phone numbers, Authenticator app, or other verification options will be removed. You will need to set up new MFA methods during your next login. Please ensure you have access to a valid phone number or the Microsoft Authenticator app before attempting to sign in again.  Hopefully it will help work with your issue and if you have any other questions or need further assistance, feel free to ask.   

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