In case you are setting Authenticator app for accessing your Office 365 account, you have 2 options of authenticating using the Authenticator App from you phone – Notification based and Code based. And see how you can change the preferred method to either of these types!

Notification Based

Here’s how the notification based authentication works –

1. When you enter your username and password, you’ll see this on your browser intimating that the Approval request has been sent to your phone.
   
   
2. On the phone, you’ll receive the below
   
   
3. And upon opening the notification, the Microsoft Authenticator App will be opened and the permission to Approve or Deny the authentication request for your account will pop-up.
   
   
4. Once you click on Approve, you’ll be able to login.

Code Based

And when Code based method is selected, you’ll see the below –

1. On the browser when you enter your username and password, you’ll see the below waiting for you to refer to the Authenticator App and enter the same from your phone.
   
   
   
   
2. Once you open the Authenticator App and open the Account which you are trying to log in, you’ll see a code in bold letters which refreshes after a time frame.
   
   
3. Once you enter this code, you’ll be able to log in.

Changing the Authentication Method

Here’s how you can change the type of authentication method when you log into your Office 365 –

1. Navigate to the menu on the top right.
   
   
2. Now, on the left hand side, look for Security Info.
   
   
3. You can then see the different authentication methods you’ve entered like phone, authenticator app etc.
   For simplicity, I only have 1 entered i.e. Authenticator App [Microsoft Authenticator].
   
   And now, since Microsoft Authenticator is set as the default method, I’ll also get an option to change the type of authentication set.
   
   
4. I’ll get two options –
   “App based authentication – notification” – This will show a pop-up on the phone in the form of a notification which you can choose to Approve or Deny.
   “App based authentication or hardware token – code” – This will need you to open the Microsoft Authenticator Apps in your phone and then look for the code in the account and enter it when asked as seen in this post above.
   
   
5. So, you can select the other method apart from the one you have selected and you should be good to go.
   
   
   

Hope this helps!

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Thank you!