Windows 10: how to start this authenticator app?

I have an id and forgot the password, it linked with an id was no longer existed. MS shows msg: 'Use my authenticator app', how to start this authenticator app?

:)

 

Microsoft Authenticator

Hi,

Thank you for writing to Microsoft Community Forums.

I understand that you want to how the Microsoft Authenticator App works.

The Microsoft Authenticator app helps you sign-in to your accounts if you use two-factor verification. Two-factor verification helps you to access your accounts more securely, especially while viewing
sensitive information. Because passwords can be forgotten, stolen, or compromised, two-factor verification is an additional security step that helps protect your account by making it harder for other people to break in.

You can use the Microsoft Authenticator app in multiple ways, including:

• Respond to a prompt for authentication after you sign in with your username and password.
  
• Sign-in without entering a password, using your username, the authenticator app, and your mobile device with your fingerprint, face, or PIN.
  
• As a code generator for any other accounts that support authenticator apps.
  

I suggest you refer to the article for more information on
What is the Microsoft Authenticator app?and you may also
refer to the article about Microsoft Authenticator app FAQ

However, let me point you in the right direction where you can get the appropriate assistance regarding this issue. I suggest you to post your query in
Microsoft Authenticator App forums
where we have expertise and support professionals.

Hope it helps.

Regards,

Zaki

 

New Microsoft Authenticator version for Android and iOS - Oct. 12

Two factor authentication (TFA) is easy, convenient, and secure when you use Microsoft Authenticator. Use your phone, not your password, to log into your Microsoft account. Just enter your username, then approve the notification sent to your phone. Your fingerprint, face ID, or PIN will provide a second layer of security in this two step verification process. After youve signed in with two factor authentication (TFA), youll have access to all your Microsoft products and services, such as Outlook, OneDrive, Office, and more.

Microsoft Authenticator version 6.2010.6717 for Android

Source: Microsoft Authenticator - Apps on Google Play




Microsoft Authenticator version 6.4.39 for iOS

Download: Microsoft Authenticator | App Store

 

Microsoft Authenticator (beta) app in Store

Source: Microsoft Authenticator (beta)