When logging into a service, you will be asked to setup multi-factor authentication on your phone or device.
When given this prompt, after going to myaccount.microsoft.com, click Next.
A new page will open up that will ask you to download the app to your phone. Click the “Download now” link or use the QR code from below. If you use an Android phone, go to the Google Play store and install the Microsoft Authenticator app. If you use an iPhone, use the Apple store to download the app.
After you have clicked "Download Now," follow the links below, or use the QR codes from below to install the Microsoft Authenticator app.
Once the app has installed click "Next" on your computer or device.
Now a screen similar to this will appear. You will now need to move to the Microsoft Authenticator app on your phone.
On the Authenticator app, tap the plus button.
Tap, "Work or school account," then "Scan QR code"
Scan the QR Code. Make sure you scan the QR code with the Microsoft Authenticator App, not just using the device's camera app.
Note: Make sure you have allowed the app to access your Camera.
Once the QR code is scanned, click next to send a test notification to the Microsoft Authenticator app.
Approve the authentication prompt on your Microsoft Authenticator app by entering the two-digit number shown to sign in.
Click Done. Your Microsoft Authenticator app is now set up and ready to use to authenticate your logins.