Forum Discussion
Multi-factor Authentication breaks outlook
Please be aware that Microsoft has announced that it is going to forbid App passwords (i.e. basic authentication) for clients accessing Outlook Web Services beginning in October of 2020. I've been testing Outlook on Android and there are currently many issues regarding 2-way, unattended, sync of contact information between Office 365 and Outlook App for Android. I've reported all of the issues I identified to Outlook App support, and they say they will address them. I'm also hoping that Android App providers like Samsung Mail App and Google Gmail App will be updated to support Modern Auth.
https://techcommunity.microsoft.com/t5/Exchange-Team-Blog/Improving-Security-Together/ba-p/805892
Thanks to a post by Phillip Lyle on https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-auth-and-exchange-online-february-2020-update/ba-p/1191282, I discovered that Samsung Native Email App supports "Modern Auth". I'm running Version 6.1.11.6 on Android Pie.
You have to remove the existing "Basic Auth" account from the email app, and add it back by selecting "Office 365" type of account instead of "Exchange" type of account.
As you are doing this, the setup will prompt you with the Microsoft Modern Authentication dialogue box to log you in.
This will also re-create your calendars and contacts, so you might have to re-customize things like Calendar Color, Custom Ringtones (which are stored in the Contacts information), and Mail Signatures. You might want to check all of the settings in Calendar, Contacts, and Mail before removing the "Basic Auth" account instance.
Finally, when complete, you might want to delete the App password that you used to authenticate the "Basic Auth" account on Android from your Office 365 account. Then, if you use a device that you forgot had Basic Auth access to your Exchange Service, the login will be rejected and you can install a Modern Auth app on the forgotten device.