Having trouble setting up O365 email with app password.

[Craig Lathrop]

I'm trying to setup an email account for our serivce desk. We use O365 for email and have MFA enabled. I setup an app specific password for the account, and checked that IMAP is enabled. I simply get an "Authentication Failed" messages when I try to connect. I've tried entering manual settings as well.

Has anyone else with MFA enabled successfully connected a private email account that was on O365? 

[Craig Lathrop]

If your Microsoft 365 tenant has security defaults turned on you cannot use a custom email address. Security defaults removes support for legacy authentication methods such as IMAP. 

[Dave Liao]

@Craig Lathrop - hi Craig! If you're an Office 365 admin (or can coordinate with your company's Office 365 admins), can you verify that the port you're trying to access can accept traffic?

What do you mean by "private email account"? As opposed to a shared mailbox?

[Craig Lathrop]

By private account I mean not using the support@domain.atlassian.com address. After some digging it turns out that JIRA doesn't support advanced authentication. With "security defaults" turned on there is no way to connect. If I understand the MS press release correctly, in October it looks like Microsoft will turn off support for legacy authentication (IMAP) for all users regardless of "security defaults".  I imagine that when that happens there will be enough pressure from users to have support for OAuth2.0 added for email accounts.