In this guide, you will find instructions about fixing errors with two-factor authentication.

We recommend the Microsoft Authenticator and Google Authenticator apps.

In addition, we recommend adding an SMS method in case something happens to the smart device where the applications are installed.

Different types of errors can occur when using two-factor authentication:

phone number: no access, because the device is not available; new phone number
smart device: not working; lost device; new smart device; the device is temporarily unavailable
key: Key or PIN is forgotten

No access to authentication method(s).

If you do not have access to two-factor authentication, contact IT helpdesk.

Changing the phone number

Open the website https://mysignins.microsoft.com/security-info.
Log in using the format username@ut.ee.
In the window that opens, the devices and phone numbers associated with your user are displayed. To delete an old number, press the Delete button to the right of the phone number.
To confirm, click the OK button.
After deleting your old phone number, select Add sign-in method.
From the drop-down menu, select Phone and click Add.
Select area code Estonia (+372) and enter your phone number. Then click Next.
A message will be sent to your phone number, the sender is Microsoft and the content is a 6 digit code.
Enter the code on your browser and click Next.
SMS authentication is activated. To finish, press Done.
After setting up, the mobile phone number to which it is associated will be displayed.
The next time you log in to Office365, in addition to the password, you will also be asked for the code that came with the message. If you are at your home or work computer, you can let the computer remember it, i.e. within 180 days, you will no longer be asked for the second-level code at a specific computer.
NB! Do not trust a device you are not sure about.

Open the website https://mysignins.microsoft.com/security-info.
Log in using the format username@ut.ee.
In the window that opens, all added devices and phone numbers will be shown. To remove a device, click the Delete button next to the application you would like to remove.
To confirm, click the OK button.
To add a new device, follow the Microsoft Authenticator or Google Authenticator instructions.