Outlook Login Problems

Fix Outlook for Mac Authentication Error When Adding Microsoft 365

Khadija Khan Oct 19, 2026 869 views

Question details

Users are unable to add a Microsoft 365 account to Outlook for Mac due to repeated credential prompts and configuration failures.

How to Fix Outlook for Mac Authentication Errors Adding Microsoft 365

Product: Outlook for Mac
Device & OS: macOS
Scenario: Adding a Microsoft 365 email account to the Outlook for Mac desktop application.
Observed behavior: Outlook repeatedly prompts for credentials or displays the error message 'An authentication error occurred while configuring account' despite successful logins on the web.

Before you start

Before troubleshooting the desktop app, log in to outlook.office.com via your web browser to verify that your Microsoft 365 account credentials are correct and active.

Solution 1Recommended

Create a New Outlook Profile

A corrupted Outlook profile is a common cause of authentication errors. Creating a fresh profile can resolve configuration blocks.

When Outlook configuration files become corrupted, the app fails to authenticate your Microsoft 365 account credentials properly. Bypassing the corrupted data by establishing a brand new profile often resolves these recurring prompts.

Locate Microsoft Outlook

Open Finder, go to the Applications folder, right-click (or Control-click) on 'Microsoft Outlook', and select 'Show Package Contents'.

Launch the Profile Manager

Navigate to Contents > SharedSupport and double-click 'Outlook Profile Manager' to launch the utility.

Create a New Profile

Click the Add (+) button to create a new profile and assign it a name. Set it as your default profile using the gear icon dropdown menu.

Add Account

Restart Outlook for Mac under the new profile and attempt to add your Microsoft 365 account again.

Profile Switch: Creating a new profile does not delete your old one. You can switch back using the Profile Manager if needed.

Solution 2

Clear Cached Credentials in Keychain Access

Outdated or corrupted saved passwords in macOS Keychain can prevent Outlook from authenticating newly added accounts.

Solution 3

Update macOS and Microsoft Office

Outdated software can cause compatibility issues with Microsoft 365 authentication protocols.

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Frequently Asked Questions

Why does Outlook for Mac keep asking for my password?

This often happens due to a corrupted Outlook profile or outdated authentication tokens stored in your Mac's Keychain Access. Clearing your Keychain or creating a new profile usually stops the recurring prompts.

Will deleting my Outlook profile erase my emails?

If you are using a Microsoft 365 or Exchange account, your emails are securely stored on the server. Creating a new profile will simply re-sync your data from the cloud without permanently deleting your messages.

How do I know if the authentication error is an account issue or a Mac issue?

Try logging into your Microsoft 365 account via a web browser (outlook.office.com). If you can sign in successfully on the web, the account is fine, and the issue is likely related to the Outlook for Mac app or your macOS Keychain.

Does updating macOS fix Outlook login errors?

Yes. Microsoft 365 implements strict security protocols that sometimes require the latest macOS and Office security updates to authenticate connections properly.

Outlook & Email Problems