How to enable strong authentication (MFA)

Strong authentication (MFA) allows safer login to services, as it makes it possible to prevent access to O365 account even if the ID/password is compromised. In addition to regular username and password, a separate confirmation is required using mobile app. Alternative ways are a one-time code, a text message, or a phone call. More details about why MFA is necessary can be found here.

Things to notice

After enabling MFA, some old, incompatible applications may not work. Such can be for example some phone manufacturers own customized email applications.

Jamk’s ICT services recommends following supported and tested applications:

  • Windows: Office 2016 or newer, Microsoft 365 Apps for enterprise (formerly known as Office 365 proplus)
  • Android: Microsoft Outlook
  • MacOS: Apple Mail 12 or newer, Office 2016 or newer, Microsoft 365 for Mac
  • iOS: Microsoft Outlook

General introduction to enabling MFA

  • Enabling MFA only takes few minutes.
  • You will need a mobile device to which you want to send MFA confirmation messages.
  • After starting the process, you will have few minutes to complete it. If this is not done quickly enough, the deployment may fail and the process will need to start over.

Instructions for implementing MFA:

You can enable MFA for your account by logging in to Office365 and then following instructions given there. You might also want to check frequently asked questions at the end of this page.

This page explaines process with more details. You can configure MFA either by using only mobile phone or by using a combination of mobile phone and computer. For instructions on both different methods below, select the one you want.

New phone or problems with Authenticator app?

You can add new authentication method for your Office365 account at It is recommended to remove any unnecessary/unused authentication methods to keep your account secure (E.q your old mobile devices that you no longer have access to).

If you no longer have access to your Authenticator app or it’s not working, you will need to reset your account MFA settings using these instructions.

Here are few common questions/answers (FAQ).