MFA issue in office 365 with Apple Mail

Issue:

Now that Multi-Factor Authentication (MFA) is enabled on my account, I can no longer access my email using Apple Mail.


Environment:

MFA enabled on the account
Must have Mojave (10.14) or higher

Cause:

Some applications are not compatible with MFA, or require an app password to be created.

Resolution:

If your mac OS X is older than 10.14, you will not be able to access your email with Apple Mail once MFA is enabled on your account. However, you may still access your email from your preferred web browser at outlook.office365.com.

If you have Mojave (10.14) or newer, set up an app password in your Office 365 account. Then add your email account as you normally would in Apple Mail, using your app password

Important Notice: Microsoft will be ending support for basic authentication for EWS, EAS, IMAP, POP, and RPS to access Exchange Online on 10/13/20. (This change does not affect SMTP AUTH.) This means that the app password will no longer be available to use after 10/13/20.

Because Microsoft is retiring basic authentication in October of 2020, it is instead highly recommended that you switch to using an application that supports modern authentication, OAuth 2.0. The Outlook app provides the best overall experience for Exchange users. All outlook versions including and newer than Outlook 2013 support OAuth 2.0.

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