On your PC: Click ‘Next’
On your phone: Open the App Store
Search for ‘Microsoft Authenticator’
Tap Install
On your PC: Change the option under ‘How should we contact you’ to Mobile App
Click ‘Set up’
On your phone: If asked, choose ‘Allow Notifications’
Choose ‘Scan a QR Code’
On your phone: Use your phone to scan the QR code
On your PC: Click Next
On your phone: Press ‘Approve’
On your PC: Click Next
On your PC: Click Done