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How to Fix Office 2021 for Mac Activation and Username Errors
Question details
The user is experiencing repeated activation prompts and username errors in Office 2021 for Mac after a hardware service, despite owning a valid license.
- Product
- Microsoft Office 2021
- Device & OS
- Mac OS (MacBook Pro)
- Scenario
- Attempting to open and activate Office 2021 applications on a MacBook Pro that was recently serviced.
- Observed behavior
- Office continually requests activation or displays incorrect username errors, failing to recognize the valid Microsoft account license.
Verify that your Microsoft account possesses a valid Office 2021 license by logging into the official Microsoft Services & subscriptions page before altering system keychain files.
Clear Mac Keychain and Remove Office License Files
Resolve persistent activation issues by completely clearing old credentials and cached identities from your Mac's Keychain Access.
When a Mac undergoes service or a major update, cached authentication credentials can become corrupted or desynchronized. By manually removing outdated license files and identity caches from the Keychain, you force Office to establish a fresh, clean connection with Microsoft's activation servers.
Open any Microsoft Office application, sign out of your account, and completely quit all Office programs running on your Mac.
Press Command + Space to open Spotlight Search, type 'Keychain Access', and press Return to launch the application.
In the Keychain Access search bar, type 'Microsoft Office'. Locate the entries named 'Microsoft Office Identities Cache' and 'Microsoft Office Identities Settings', right-click them, and select 'Delete'.
Next, search for 'ADAL' in Keychain Access. Select any remaining entries associated with Microsoft Office and delete them to clear out outdated authentication caches.
Download and run the official Microsoft Office License Removal Tool for Mac to securely erase corrupted activation files, then restart your MacBook Pro.
Launch Word or Excel, and sign in using the Microsoft account email associated with your Office 2021 license to reactivate the software.
Switch to WPS Office for a Hassle-Free Mac Experience
If persistent Microsoft Office activation loops and credential errors keep interrupting your workflow, consider switching to WPS Office. It provides a lightweight, free, and highly compatible workspace that eliminates the frustration of complex license management.
- 1. Download the App: Visit the official WPS website and download the Mac version of WPS Office.
- 2. Install on your Mac: Open the installer and drag the WPS Office icon into your Applications folder.
- 3. Open your files: Launch WPS Office to instantly open and edit your existing Microsoft Office documents without activation hurdles.
Frequently Asked Questions
Why is my Mac repeatedly asking me to activate Office 2021?
This frequently happens if the Keychain credentials on your Mac become corrupted, which is common after a macOS update, hardware repair, or system migration. Clearing these cached files forces a fresh activation.
Will removing Office license files delete my saved documents?
No. Removing license files and clearing Keychain Access only resets the software's authentication data. Your personal Word, Excel, and PowerPoint files are securely stored on your drive and will not be affected.
How do I confirm which account is linked to my Office 2021 license?
Navigate to account.microsoft.com, sign in with your email, and go to the 'Services & subscriptions' section. This page will display whether the signed-in account owns an active Office 2021 license.
What are ADAL entries in Mac Keychain Access?
ADAL stands for Active Directory Authentication Library. These entries are stored tokens used by Microsoft applications to keep you securely signed in. Deleting them is completely safe and helps resolve sign-in loops.
