Since upgrading to iOS14 on iPhones or iPads shared mailboxes accessed via IMAP on Exchange online have stopped working.
You get a very generic error,
Cannot Get Mail The mail server "outlook.office365.com" is not responding. Verify that you have entered the correct account info in Mail settings."
Deleting the account in iOS14 and re-adding it results in error about SSL.
Cannot Connect Using SSL Do you want to try setting up the account without SSL?
Eventually resulting in the following error message.
Cannot Get Mail Logins are disabled for [insert description]
Using the IMAP method to access shared mailboxes is still working fine on other iOS13 devices.
I know Microsoft are planning on retiring basic authentication have they some rolled inline with an iOS update?
Details of the IMAP method to access shared Exchange online Mailboxes.
Incoming Mail Server Hostname: outlook.office365.com Username: [your username]\[email address of shared mailbox] Password: [Your password] Outgoing Mail Server Hostname: smtp.office365.com Username: [your username] Password: [Your password]