Microsoft Authenticator FAQs - Microsoft Support
To remove the app from a device using a work or school Microsoft account, go to the two-step verification area of either your My Apps page or your organization's company portal to turn off verification for your old device.
Sign in using Microsoft Authenticator - Microsoft Support
Many apps allow you to authenticate by entering a code on another device such as a PC. If you want to sign in on a remote computer to install Authenticator, follow these steps.
Use mobile operator billing with your Microsoft account
In certain countries and regions, mobile operator billing can be used as a payment option to buy subscriptions like Game Pass and content such as games, apps, music, HD movies, and TV shows on your Xbox console and Xbox.com.
Download Microsoft Authenticator - Microsoft Support
The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.
About Microsoft Authenticator - Microsoft Support
Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.
Use Microsoft Authenticator with Microsoft 365
If your organization is using multi-factor authentication (MFA) for Microsoft 365, the easiest verification method to use is the Microsoft Authenticator smart phone app.
Set up your Microsoft 365 sign-in for multi-factor authentication
The default authentication method is to use the free Microsoft Authenticator app. If you have it installed on your mobile device, select Next and follow the prompts to add this account.
Applies To: Microsoft 365 admin
Sign in to your work or school account using two-step verification ...
With two-step verification, you'll get a security code to your email, phone, or authenticator app every time you sign in on a device that isn't trusted. Need more help?
Common problems with two-step verification for a work or school account
Install and use the Microsoft Authenticator app If you've tried these steps but are still running into problems, contact your organization's Help desk for assistance.
How to add your accounts to Microsoft Authenticator
Learn how to add all your different accounts to the Microsoft Authenticator app.