Forum Discussion
MFA and legacy auth
Both the native Mail app and Outlook support modern auth/MFA, so you should be fine.
Taen keren Hi, I usually don't work with these questions but, yes you're right as Outlook for iOS use modern authentication. When modern authentication is enabled app passwords aren't required.
ADAL-based authentication is what Outlook for iOS and Android uses to access Exchange Online mailboxes
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-for-ios-and-android/setup-with-modern-authentication#modern-authentication
You can enroll the devices with one-time MFA prompt, if that's what you are looking for.
'Require multi-factor authentication for Intune device enrollments'
https://docs.microsoft.com/en-us/mem/intune/enrollment/multi-factor-authentication