Update: The full timeline for retirement of Basic Authentication in Exchange Online is now published in Basic Authentication Deprecation in Exchange Online – September 2022 Update.
In about 150 day...
Updated Sep 01, 2022
Version 5.0
Blog Post
1. Clear, I've set the policy to my account and this is working.
2. I don't understand your remark that it doesn't need a password. How on earth will it verify your the one connecting?
We have a federated domain so I'm diverted to our ADFS connection (sts) to logon once, then it configures the mail client.
It shows up in the Sign-in log as application "Apple internet Accounts", Client app "Mobile Apps and Desktop clients", Client credential type "None". Should that be an indication that it is doing Modern Auth? At "Authentication Details" it says "No Authentication Details". Would be nice if it said "Modern Auth".
3. As Global admin I've given consent to use the iPhone native email client for Apple devices and Gmail app for Android devices.
4. Ok, that makes sense, but so little information? Like I said in point 2, it would be nice if Microsoft gave us more information.