Login issue due to authenticator app not intalled

Hello Sudhakar Pokharkar

First of all, I would like to clarify one point: this forum is intended for users to assist one another. No one here, including myself, has the authority or the tools required to unlock MFA on your behalf.  

I’ll give it a try to provide all the information I can to support you move forward.

Just to clarify, could you confirm your account type?

• Work account (@companyname)
• Educational account (@edu)
• Personal account (@outlook.com, @hotmail.com)

If your account belongs to an organization (company or school), you no longer have access to your old phone, and you cannot use any other verification method (such as a phone call, SMS, or email) to sign in, you will need to contact your IT Administrator or Global Administrator. They are the only ones who can reset or update your authentication methods so you can regain access to your account.

Manage user authentication methods for Microsoft Entra multi-factor authentication

• Sign in to Microsoft Entra - Microsoft Entra admin center
• User -> all users. Select the user you want to act on, and then select "Authentication methods". then select "Require multi-factor authentication re-registration".

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

*Note:

• Please note that in this case, you only need to find the global admin of your organization’s tenant. They are the ones who can help you regain access to your account.
• The global admin is usually someone in your school’s IT team or a system administrator. They manage Microsoft 365 settings, licenses, and security.

I hope I’ve been able to help in some way. I look forward to your update.

Kind regards,