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Fix Microsoft To Do Sign-In Window Not Working on Mac
Question details
The user is unable to sign into Microsoft To Do on macOS because the sign-in or account window is completely unresponsive, even after a fresh installation.
- Product
- Microsoft To Do
- Device & OS
- macOS
- Scenario
- Attempting to log into the Microsoft To Do desktop application to sync tasks.
- Observed behavior
- Clicking the sign-in button or account menu does nothing. The authentication window fails to appear, preventing the user from accessing their account.
Ensure your Mac is connected to a stable internet connection and that you have saved any offline work in your other open Office applications before proceeding with credential resets.
Clear Microsoft Credentials in Keychain Access
Corrupted or outdated keychain entries can block the sign-in window from launching. Removing them forces the app to request fresh authentication.
macOS stores your application passwords in Keychain Access. When authentication tokens for Microsoft services become corrupted, the sign-in prompt may silently fail.
Sign out of all running Microsoft Office applications and quit them completely.
Open Finder, navigate to Applications > Utilities, and double-click on 'Keychain Access'.
Use the search bar in the top right corner to look for 'Microsoft' and 'Office'. Right-click on any related keychain entries and select 'Delete'.
Restart your Mac, launch Microsoft To Do, and click the sign-in button again.
Run the Office License Removal Tool
Conflicting or corrupted Office license files on your Mac can interfere with Microsoft To Do's authentication process.
Update macOS and Test in Safe Mode
System updates can patch background bugs causing the sign-in failure, while Safe Mode helps rule out third-party app conflicts.
Try WPS Office for a Seamless Mac Experience
If you are experiencing ongoing credential, licensing, or sign-in issues with Microsoft products on your Mac, consider switching to WPS Office. It is a lightweight, fully-featured alternative that provides a smooth, hassle-free document editing experience on macOS.
- 1. Download WPS Office: Visit the WPS website and download the Mac version.
- 2. Install on macOS: Open the installer and drag the WPS Office icon to your Applications folder.
- 3. Open Your Files: Launch WPS Office and instantly open your existing Microsoft Office files without formatting loss.
Frequently Asked Questions
Why won't the sign-in window open in Microsoft To Do on Mac?
This is typically caused by corrupted Microsoft credentials stored in your Mac's Keychain Access, outdated macOS components, or conflicting Office license files preventing the authentication window from rendering.
Will clearing my Microsoft keychain entries delete my files?
No, clearing your keychain entries only removes stored passwords and authentication tokens. Your personal files, tasks, and application data remain completely untouched.
What should I do if Safe Mode doesn't fix the sign-in issue?
If Safe Mode and the license removal tool do not resolve the issue, you may need to completely uninstall Microsoft To Do, ensure your macOS is updated to the latest supported version (such as Monterey 12.7.2 or newer), and then reinstall the app from the Mac App Store.
