To configure the Outlook App on your iPhone, please follow the steps below. Replace the placeholders with your actual details:
Email Address: Replace username@example.com with your actual email address.
If this is your first email account in Outlook, the "Add Account" screen will appear automatically. If not, tap:
On the "Add Account" screen, enter your email address:

Outlook tries to guess the settings. The IMAP settings screen shows up. Tap < (top left) to go back. You will return to the email address screen. Tap Set Up Account Manually (this option only appears after auto-setup fails). When prompted to select an email provider, choose the IMAP option under Advanced:

The IMAP settings screen will appear. Ensure that Use Advanced Settings is toggled on. Enter the following settings:

Tap Sign In. Swipe through privacy and diagnostic data screens, if they appear.
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