How to Set Up Microsoft 365 Multi-Factor Authentication (MFA) on First Login

When signing in to Microsoft 365 for the first time, you may be prompted to complete two steps:

1. Change your password (if your account is newly created or has recently been reset).

2. Set up Multi-Factor Authentication (MFA) using the Microsoft Authenticator app — this is the only supported method for additional account security.

Follow the steps below to complete your setup.

Step 1: Sign In to Microsoft 365

1. Go to https://portal.office.com.

2. Enter your full Microsoft 365 email address and click Next.

3. Enter your temporary or current password and click Sign In.

Step 2: Change Your Password (If Prompted)

If prompted to change your password:

1. Enter your current (temporary) password.

2. Create and confirm a new secure password.

   • Your new password should include a mix of uppercase and lowercase letters, numbers, and symbols.

3. Click Sign In to proceed.

Step 3: Set Up Multi-Factor Authentication (MFA) with Microsoft Authenticator

After signing in, you will see a message saying:
"More information required."
Click Next to begin the setup process.

What You'll Need

• A smartphone with internet access

• The Microsoft Authenticator app (free to download from your device’s app store)

Installation and Setup

1. On your phone, install the Microsoft Authenticator app:

   • iOS: Download from App Store

   • Android: Download from Google Play

2. On your computer, after clicking Next, a QR code will appear on screen.

3. On your phone:

   • Open the Authenticator app

   • Tap the + icon or select Add Account

   • Choose Work or School Account

   • Select Scan QR Code

4. Use your phone to scan the QR code shown on your computer screen.

5. Once scanned, click Next on your computer.

6. You’ll receive a test notification on your phone — approve it to complete the setup.

Final Step: MFA Setup Complete

You’ve now successfully enabled Multi-Factor Authentication using the Microsoft Authenticator app.

From now on, when logging into Microsoft 365 from a new device or location, you’ll be asked to approve the sign-in using the app on your phone.

Important Notes

• Only the Microsoft Authenticator app is supported. Other methods such as SMS or phone call are not available.

• Keep your phone secure and accessible — you'll need it to log in.

• If you change phones or lose access to the app, please contact Fusion IT Support as soon as possible so we can reset your MFA setup.

Need Help?

If you experience any issues during setup, please get in touch with our support team:

• Ticket Portal: https://support.fusionit.uk

• Email: support@fusionit.uk

• Phone: 01244 835080

Disclaimer:
This article is intended as a general guide. While we aim to ensure accuracy, Fusion IT cannot be held responsible for any issues, data loss, or damage resulting from the use or misapplication of these instructions. If in doubt, please contact our support team before making changes.