Office for Mac Issues

Fix Outlook Send to OneNote Sign-In and Silent Authentication Errors on Mac

Maira Mehtab Sep 20, 2026 868 views

Question details

Users are encountering a sign-in loop and a cross-origin silent-authentication error when trying to send emails from Outlook to OneNote on a Mac.

Product: Microsoft Outlook and OneNote for Mac
Device & OS: Mac
Scenario: Sending an email directly to OneNote using the Outlook integration on macOS.
Observed behavior: Outlook repeatedly requests sign-in and throws a cross-origin silent-authentication error. Additionally, the local OneNote Mac app may fail to launch, even though the web version of OneNote continues to function normally.

Before you start

Verify that you can successfully log in to OneNote on the web via your browser to ensure your Microsoft account credentials are correct and active.

Solution 1Recommended

Uninstall and Reinstall OneNote and the Outlook Add-in

Refreshing the application files and integration add-in can clear corrupted authentication tokens causing the silent-authentication error.

Since the issue often stems from a breakdown in communication between the two apps, completely removing the integration components and reinstalling them forces a fresh authentication prompt.

Remove the Outlook Add-in

Open Outlook for Mac, navigate to 'Get Add-ins' or 'Manage Add-ins' from the toolbar, locate the 'Send to OneNote' add-in, and select 'Remove'.

Uninstall OneNote

Open the Finder, go to the Applications folder, locate Microsoft OneNote, drag it to the Trash, and empty the Trash.

Reinstall OneNote

Open the Mac App Store, search for Microsoft OneNote, and download the latest version.

Re-add the Integration

Open Outlook, go back to the Add-ins menu, search for 'Send to OneNote', and click 'Add'. Restart both applications and attempt to send an email to OneNote.

Sync Important Data First: Ensure any local notebooks are fully synced to the web version of OneNote before uninstalling the app to prevent data loss.

Solution 2

Compare Configurations and Update Office

Identifying differences between a working Mac and the affected Mac helps pinpoint outdated software or conflicting settings.

Solution 3

Use Apple Native Apps as a Workaround

Bypass the broken Microsoft integration temporarily by using built-in Apple tools.

Free Microsoft Office alternative

Switch to WPS Office for a Seamless Experience on Mac

If persistent Microsoft Office integration errors disrupt your workflow, consider using WPS Office. It provides a lightweight, unified, and highly compatible alternative for document creation and editing on Mac without the hassle of complex cross-app authentication issues.

1. Download and Install: Visit the official WPS Office website and download the macOS version.
2. Open Your Documents: Launch WPS Office and easily drag and drop your existing .docx, .xlsx, or .pptx files into the app.
3. Enjoy Unified Editing: Edit and manage your documents, spreadsheets, and PDFs all from a single window.

Completely free and lightweight Office suite for Mac usersFully compatible with Microsoft Word, Excel, and PowerPoint formatsAll-in-one tabbed interface for seamless document managementAvoids complicated multi-app integration errors

microsoft office alternative - wps office

Frequently Asked Questions

What does a cross-origin silent authentication error mean in Outlook?

This error typically occurs when the Outlook add-in attempts to securely authenticate your session with the OneNote service in the background but is blocked by security protocols, corrupted tokens, or browser-level origin restrictions.

Why does OneNote work online but fail to launch on my Mac?

The web version of OneNote operates independently in your browser, whereas the Mac app relies on local application files and cached credentials. If those local files or macOS keychain entries become corrupted, the app will fail to launch.

Can I manually clear Office credentials on my Mac?

Yes. You can open the 'Keychain Access' app on your Mac, search for 'Microsoft Office' or 'ADAL', and delete the relevant cached credential entries. This will force Outlook and OneNote to prompt for a clean sign-in upon restarting.

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