Install the Microsoft Authenticator app from the App Store to help set up your MSN Mail account in the Apple Mail app on your iPhone or iPad. During the sign-in process, Microsoft may ask you to verify your identity using a code or an approval request sent to the Authenticator app. Follow the on-screen instructions to complete the verification and finish adding your MSN Mail account to Apple Mail.
Note: The verification method may vary depending on your Microsoft account’s security settings.


Go to the Advanced security options of your Microsoft account dashboard and scroll down to the App passwords section. Create password. Enter this app password ...Read more
How to get and use app passwords


Select Generate an app-specific password, then follow the steps on your screen. Enter or paste the app-specific password into the password field ...Read more
Sign in to apps with your Apple Account using app-specific ...