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How to Fix Microsoft 365 Sign-In and Activation Errors on Mac
Question details
The user needs to resolve sign-in and activation errors for Microsoft 365 on a Mac, which may be caused by credential conflicts or outdated operating systems.
- Product
- Microsoft 365
- Device & OS
- Mac
- Scenario
- Attempting to sign in to or activate a Microsoft 365 application on macOS.
- Observed behavior
- The application fails to activate or sign in, returning an error message, sometimes due to the Mac running an unsupported, older version of macOS.
Verify your Microsoft account credentials by logging into the Microsoft website on your browser, and check your current macOS version by clicking the Apple menu and selecting 'About This Mac'.
Clear Office Credentials from Mac Keychain
Damaged or corrupted Keychain credentials are the most common cause of sign-in loops and activation errors on Mac.
Open any Microsoft 365 app, such as Word. Click on the 'Word' menu at the top left, select 'Sign Out', and then quit the application.
Open Finder, navigate to Applications > Utilities, and double-click 'Keychain Access'.
In the search bar at the top right of Keychain Access, type 'Office'. Right-click any entries related to Microsoft Office or Microsoft 365 and select 'Delete'.
Restart your Mac, open Microsoft Word again, and sign in with your correct work, school, or personal account to reactivate.
Reset the Activation State and Reinstall
If clearing the Keychain does not work, resetting the activation state using Microsoft's official tool and cleanly reinstalling the app can bypass deeper software conflicts.
Switch to WPS Office for a Hassle-Free Mac Experience
If your macOS is too old for the latest Microsoft 365 updates or you are tired of complex activation errors, WPS Office offers a free, lightweight, and highly compatible alternative for Mac users.
- 1. Download for Mac: Visit the official WPS Office website and download the macOS installation package.
- 2. Install WPS Office: Open the downloaded .dmg file and drag the WPS Office icon into your Applications folder.
- 3. Open Your Files: Launch WPS Office and directly open your existing Word, Excel, or PowerPoint files to continue working.
Frequently Asked Questions
Why can't I update Microsoft 365 on my Mac?
Microsoft typically only supports the three most recent major versions of macOS. If your Mac is running an older operating system, the Microsoft AutoUpdate tool will block new installations. You will need to either upgrade your macOS or download an older, compatible version of Office.
How do I find an older version of Microsoft 365 for my outdated Mac?
You can find older installer packages on the official 'Update history for Office for Mac' page on the Microsoft Learn website. Look for a release date that aligns with when your current macOS version was still supported.
What is the Microsoft License Removal Tool?
It is an official utility provided by Microsoft Support that scrubs all existing Office license files from your Mac's deep system folders. This is often necessary when your Mac is stuck in an activation loop or thinks an expired account is still signed in.
