MFA on Apple integrated iMail

We had a few growing pains enabling MFA/2FA on our Microsoft Office 365 online domain for iPhones using the integrated iMail app

Before you leap, check the following setting from your admin account

Show All, Settings, Org settings, Modern Authentication

I suspect the default setting depends on how old your domain is.

If Modern authentication is not enabled you are in for a world of head-scratching.

Second trick is to get users to authenticate to a Microsoft App first and open Apple mail second.

Source https://techcommunity.microsoft.com/t5/identity-authentication/office-365-mfa-enabled-users-and-the-apple-mail-app-for-ios/m-p/222553

sduncan