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Fix Blank White Screen When Signing In to Office 365 on Mac
Question details
Users encounter a blank white screen when attempting to sign in to Microsoft 365 applications on a Mac using a university or enterprise account.
- Product
- Microsoft 365 / Office 365
- Device & OS
- macOS
- Scenario
- Signing into Microsoft Office applications to activate the suite with a university account.
- Observed behavior
- A blank white screen appears during the authentication process, and standard troubleshooting like reinstalling the software does not resolve the issue.
Ensure your Mac has a stable internet connection and temporarily disable any active VPNs, proxies, or strict firewall settings that might be blocking Microsoft's authentication servers.
Clear Office Containers and Keychain Credentials
Corrupted cache files or outdated login tokens in macOS can cause the Microsoft authentication screen to hang or load blank.
macOS stores application data in a secure Container folder and login tokens in Keychain Access. Clearing these forces Office to pull fresh authentication data.
Ensure all Microsoft Office applications (Word, Excel, PowerPoint) are completely closed.
Open Finder, press Command + Shift + G on your keyboard, type '~/Library/Containers', and press Return.
Locate folders associated with Microsoft Office (such as com.microsoft.Word, com.microsoft.Excel, etc.) and move them to the Trash.
Open 'Keychain Access' from Applications > Utilities. Search for 'Microsoft Office' and delete all matching identity and credential entries.
Restart your Mac, open any Office application, and attempt to sign in again.
Run the Office License Removal Tool
Completely removing existing license files forces a fresh authentication prompt.
Test with a New Mac User Account
Creating a fresh user profile helps determine if the issue is system-wide or specific to your current macOS user profile.
Try WPS Office for Mac – A Lightweight and Free Alternative
Tired of dealing with sign-in errors and blank screens on Microsoft 365? WPS Office offers a free, lightweight, and highly compatible alternative for Mac users. You can open, edit, and save Word, Excel, and PowerPoint files seamlessly without complex authentication loops.
- 1. Download WPS Office: Visit the official WPS website and download the Mac version of WPS Office.
- 2. Install the application: Open the downloaded file and drag the WPS Office icon to your Applications folder.
- 3. Open your files instantly: Launch WPS Office and open your existing Word, Excel, or PowerPoint documents without needing to sign in first.
Frequently Asked Questions
Why does Office 365 show a blank white screen when signing in on a Mac?
This is typically caused by a disruption in the authentication process. Common culprits include corrupted cached credentials in Keychain Access, leftover files from previous Office installations, or network security software (like VPNs or firewalls) blocking connection to Microsoft's login servers.
Will clearing Keychain Access delete my Office documents?
No. Clearing Microsoft entries from Keychain Access only removes saved passwords and authentication tokens. Your local and cloud documents remain entirely safe and untouched.
What is the Office License Removal Tool?
The Office License Removal Tool is a utility provided by Microsoft that safely strips all old, broken, or conflicting license files from your Mac. It is frequently used to fix activation issues so users can sign in and activate Office cleanly.
