How to reconfigure the Microsoft Authenticator app.

Q. How to reconfigure the Microsoft Authenticator app?

A. Configure the settings using the method below.

*From January 2025, the name "Microsoft 365" was changed to "Microsoft 365 Copilot".

1. Sign in to the Microsoft 365 Copilot home from your PC.
2. Click the user icon at the bottom left of the screen, then click "View account".
3. Click "Security Info" from the menu.
   
    
4. Select "+ Add sign-in method".
   
    
5. Select "Microsoft Authenticator".
   
   *Authentication methods that cannot be added—such as those already configured—will not be displayed.
    
6. If the Microsoft Authenticator app is already installed on your new device, such as a smartphone, click "Next".
   *If the app is not installed, please install it first.
   
    
7. Click "Next".
   
    
8. Open the Microsoft Authenticator app on your new device, such as a smartphone, and tap the "+" icon.
   Note: If your THERS account is already registered, it will be overwritten.
   
    
9. Select "Work or school account".
   
    
10. Select "Scan QR code".
    
     
11. Scan the QR code displayed on your PC using the Microsoft Authenticator app on the new device you want to register.
    
     
12. After scanning, click "Next" on the PC screen.
    
     
13. Enter the two-digit number displayed on your PC screen into the verification screen of the Microsoft Authenticator app on your smartphone, then select "Yes".
    
     
14. A notification approval will appear on your PC screen, and the THERS account will be added to the Microsoft Authenticator app.
    
     
15. Click "Next".
    
     
16. Please confirm that the Microsoft Authenticator app on the newly registered device has been successfully added. Note that the device name may not be displayed immediately after registration.
    
     
17. Select "Remove" for the Microsoft Authenticator app on the previously registered device.
    The device name is displayed for the older registered Microsoft Authenticator app.
    Note: Be careful not to delete the newly registered Microsoft Authenticator app.
    
     
18. Click "OK" in the confirmation dialog for deleting the authentication app.
    Confirm that the Microsoft Authenticator app on the previously registered device has been removed from the sign-in methods.
    Note: Multi-factor authentication may be required.
    
     
19. Click "Set default sign-in method" at the top of the "Security info" screen.
    If the message "You’re using the most advisable sign-in method where it applies." is displayed, no changes are necessary.
    
     
20. Select "App-based authentication – notification", then click "Confirm".
    This completes the reconfiguration of the newly registered Microsoft Authenticator app.