Office for Mac Issues

Fix Microsoft 365 Mac Apps Rejecting Valid Email Address on Sign-In

Huma Ashraf Ch Oct 9, 2026 869 views

Question details

Users are unable to sign into Microsoft 365 Mac applications because their valid email address is being rejected, despite working properly in a web browser.

Fix Microsoft 365 Mac Apps Rejecting Valid Email Address During Sign-In

Product: Microsoft 365 for Mac
Device & OS: Mac
Scenario: Attempting to sign into Microsoft Office applications on a Mac using a valid Microsoft account email address.
Observed behavior: The application rejects the email address during the sign-in process, likely due to stale or corrupted Office license files or cached identity credentials.

Before you start

Verify that your Microsoft 365 subscription is currently active by logging into your account via a web browser before troubleshooting the desktop apps.

Solution 1Recommended

Use the Official Office License Removal Tool

Clear stale or corrupted license files using Microsoft's official tool, which safely forces the apps to request fresh authentication.

When local license data becomes corrupted on a Mac, Office applications often fail to recognize otherwise valid email addresses. Removing these hidden files is the most effective way to restore normal sign-in functionality.

Download the Removal Tool

Navigate to the official Microsoft support website and download the Office license removal tool for Mac.

Run the Installer

Open the downloaded .pkg file from your Mac's Downloads folder and follow the on-screen prompts to install and run the utility.

Restart Your Mac

Once the tool confirms that the license files have been successfully removed, click the Apple menu and select 'Restart' to reboot your system.

Sign In to Office

Open Microsoft Word or Excel, select 'Sign In', and enter the email address associated with your active Microsoft 365 Family or Personal subscription.

Use the Official Office License Removal Tool

No Data Loss: Running the license removal tool only resets your activation state; it does not delete or alter any of your personal Word documents, Excel spreadsheets, or PowerPoint presentations.

Solution 2

Clear Cached Identity Credentials in Keychain Access

Remove stored Microsoft passwords and tokens from your Mac's Keychain that might conflict with your current sign-in attempt.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Mac Experience

Tired of dealing with corrupted licenses, complex subscription tools, and sign-in errors on Microsoft 365? WPS Office provides a seamless, lightweight, and powerful alternative for Mac users. You can create, edit, and save professional documents without wrestling with account validation loops.

1. Download the Mac Installer: Visit the official WPS website and download the free WPS Office installer specifically designed for Mac.
2. Install the Application: Double-click the downloaded file and drag the WPS Office icon into your Applications folder.
3. Open Your Documents: Launch WPS Office and instantly open your existing Word, Excel, and PowerPoint files without worrying about complex subscription setups.

Avoid frustrating sign-in loops and local license file corruption entirely.Fully compatible with all Microsoft Office file formats, including DOCX, XLSX, and PPTX.Lightweight architecture that launches instantly and runs smoothly on macOS.Completely free to use with a familiar, easy-to-navigate user interface.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my email work in a web browser but get rejected by the Mac app?

This discrepancy occurs because desktop applications rely on locally stored license files and cached credentials in your Mac's Keychain. When these local files become corrupted or outdated, the app rejects your email, whereas a web browser checks directly with Microsoft's live servers.

Will running the license removal tool delete my Word or Excel files?

No. The license removal tool exclusively targets hidden system files that track your activation status. Your personal documents, spreadsheets, and presentations are stored separately and will remain completely untouched.

What should I do if removing licenses and Keychain credentials doesn't fix the sign-in issue?

If the issue persists, the Office application files themselves may be damaged. You should completely uninstall Microsoft 365 from your Mac, log into your Microsoft account via a web browser, navigate to the Services and Subscriptions page, and download a fresh installer.

Office App Problems