Sign-in & Login Problems

Fix Office for Mac Sign-In Error: Another Account Detected

Olivia Miller Oct 22, 2026 868 views

Question details

Users encounter an activation message or sign-in block in Word and Excel for Mac because the system detects credentials from a different account within the same organization.

How to Fix Office for Mac Sign-In Problems When Another Account is Detected

Product: Microsoft Office for Mac
Device & OS: macOS
Scenario: Activating or signing into Office applications on a Mac using a work or school account.
Observed behavior: Word and Excel prompt an activation message and fail to sign in due to conflicting organizational credentials, even if other Microsoft apps function normally.

Before you start

Ensure you have the correct login email and password for the specific work account you intend to use before modifying your Mac's keychain settings.

Solution 1Recommended

Clear Outdated Office Credentials in Keychain Access

Removing old or conflicting cached credentials from your Mac's Keychain is the most effective way to resolve account detection conflicts.

macOS securely stores your login tokens in a system app called Keychain Access. When you switch work accounts, the old token often remains, confusing Microsoft Office and causing sign-in errors.

Quit Office Apps

Fully close all open Microsoft Office applications, including Word, Excel, and PowerPoint.

Open Keychain Access

Open the 'Keychain Access' app on your Mac. You can find it by navigating to Applications > Utilities, or by searching for it using Spotlight (Cmd + Space).

Search for Office Credentials

In the search bar at the top right of the Keychain Access window, type 'Office' to filter the list of saved passwords and tokens.

Delete Outdated Entries

Select all entries related to Microsoft Office credentials, right-click (or control-click) them, and choose 'Delete'. Confirm the deletion if prompted.

Restart and Sign In

Close Keychain Access, open Microsoft Word or Excel, and try signing in again with your correct work account.

Clear Outdated Office Credentials in Keychain Access

Safe to Delete: Deleting these entries will not erase your documents. It simply forces Office to ask for your login credentials again.

Solution 2

Use the Office License Removal Tool

If clearing the Keychain doesn't resolve the issue, completely removing the existing Office license files can force a fresh activation.

Free Microsoft Office alternative

Try WPS Office for Mac – A Hassle-Free Alternative

Tired of complex license conflicts and sign-in errors? WPS Office is a highly compatible, free, and lightweight alternative to Microsoft Office that doesn't restrict you with complicated account detection mechanisms.

1. Download for Mac: Visit the official WPS website and download the macOS version of WPS Office.
2. Install the App: Open the downloaded 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, and PowerPoint files without any conversion required.

Fully compatible with Microsoft Word, Excel, and PowerPoint formats (.docx, .xlsx, .pptx).No complex licensing conflicts or forced multi-account sign-in blockers.Lightweight installation that runs smoothly and quickly on macOS.Familiar, intuitive tabbed interface so you can start working immediately.

microsoft office alternative - wps office

Frequently Asked Questions

Why does Office for Mac detect another account from my organization?

This usually happens if you have previously signed in with a different work or school email on the same device, leaving residual authentication tokens in your Mac's Keychain that conflict with your current account.

Will deleting Keychain entries delete my Office documents?

No, Keychain Access only stores passwords and authentication tokens. Deleting these entries will only force you to sign in again; it will not affect your saved documents or spreadsheets.

Do I need to reinstall Office for Mac to fix this sign-in error?

In most cases, reinstalling is not necessary. Clearing the Keychain or using the Microsoft Office License Removal Tool is typically enough to clear the old credentials and resolve the conflicting account issue.

Can I use multiple work accounts in Office for Mac at the same time?

Microsoft Office for Mac can struggle when multiple active accounts belong to the same Microsoft 365 organizational tenant. You usually need to sign out of one account before successfully authenticating with the other.

Login & Account Issues