If you enable Azure MFA in Office 365 and try to sync mail using the native Windows 10 Mail client, this is what the user will see:
(Sorry for the Language. Just the buttons and boxes are all the same)
User needs to Select Office 365 for Azure MFAUser needs just now to enter his UPN, it can not be usernameIf it fails here then Autodiscover is broken.Observe that the mail app has pulled Down my Company details including logo and custom textRight now yor phone would ring or you would get a sms/app challengeThats itYour Company Security settings will now be Applied. Usually you get this Box regardless just to tell you that it might tighten securityYou recieve mail. If you do not see mail, mabye the mail is older than a month. Then you need to change the sync settings to enable all mail to sync down
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