Sign-in & Login Problems

Fix OneDrive and Teams Will Not Sign In on Mac

Bushra Parveen Oct 1, 2026 868 views

Question details

The user is unable to sign into Microsoft OneDrive and Teams on a Mac, despite other Microsoft Office applications functioning normally.

How to Fix OneDrive and Teams Not Signing In on Mac

Product: Microsoft OneDrive and Microsoft Teams
Device & OS: macOS Sonoma 14.5 (2019 MacBook Pro)
Scenario: Attempting to log into Microsoft cloud and communication services for synchronization and work access.
Observed behavior: Sign-in fails exclusively for OneDrive and Teams. A basic reinstall of the affected apps does not resolve the issue, and performing a complete clean reinstall causes all Microsoft 365 applications to display the same sign-in error.

Before you start

Verify that your Mac is connected to a stable network and check the Microsoft 365 Service Health portal to ensure there are no ongoing authentication outages for Teams and OneDrive.

Solution 1Recommended

Remove Stale Microsoft Credentials from Keychain Access

macOS Keychain may hold outdated or corrupted authentication tokens that prevent specific Microsoft services from signing in successfully.

Microsoft applications rely heavily on the macOS Keychain to store login sessions. If these tokens become corrupted, cloud-heavy apps like Teams and OneDrive are usually the first to fail.

Quit all Microsoft apps

Ensure Teams, OneDrive, Outlook, Word, Excel, and PowerPoint are completely closed.

Open Keychain Access

Open Finder, navigate to Applications > Utilities, and launch the 'Keychain Access' app.

Search for cached credentials

Type 'Microsoft' in the Keychain Access search bar to filter your stored passwords and certificates.

Delete Microsoft authentication entries

Select and delete all entries related to 'Microsoft Office Identities Cache', 'Microsoft Office Identities Settings', 'OneDrive', and 'Teams'.

Restart and sign in

Restart your Mac, then open OneDrive and Teams to attempt signing in with your account credentials again.

Remove Stale Microsoft Credentials from Keychain Access

Re-authentication Required: After clearing the Keychain, you will need to log back into all your Microsoft 365 applications, including Word and Excel.

Solution 2

Reset the Microsoft OneDrive App

Resetting the application forces OneDrive to rebuild its connection settings and can clear persistent sign-in loops.

Solution 3

Perform a Clean Reinstallation of Microsoft 365

If localized resets fail, a complete removal of all Microsoft 365 system files and hidden containers is required before reinstalling.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Experience on Mac

If persistent Microsoft 365 sign-in errors and licensing bugs are keeping you from getting your work done on macOS, consider switching to WPS Office. It delivers a powerful, user-friendly suite that doesn't rely on complex background authentication services to let you edit your documents.

1. Download the Mac installer: Visit the official WPS website and download the free WPS Office version for macOS.
2. Install the suite: Open the downloaded package and drag the WPS Office icon into your Applications folder.
3. Open and edit files immediately: Launch WPS Office to instantly open, edit, and save your existing Word, Excel, and PowerPoint documents without mandatory cloud sign-ins.

Highly compatible with Microsoft Office formats (.docx, .xlsx, .pptx)Free, lightweight, and optimized for macOS performanceNo complex Keychain login loops or mandatory cloud syncing hurdlesFamiliar all-in-one user interface for a seamless migration

microsoft office alternative - wps office

Frequently Asked Questions

Why are only OneDrive and Teams failing to sign in while Word and Excel work fine?

Teams and OneDrive rely heavily on continuous background cloud synchronization and use distinct authentication tokens. Corrupted keychain entries specific to cloud syncing can isolate the failure to these two apps while local editors like Word remain logged in.

Will resetting the OneDrive app delete my locally synced files?

No. Running the reset command only clears the application's configuration and connection settings. Your actual files remain safely untouched on your Mac's hard drive and in the cloud.

What does it mean if no Microsoft apps can sign in after I perform a clean reinstall?

If a full, clean reinstallation breaks the sign-in process for all Office applications, the problem is no longer with your Mac. It indicates an issue on Microsoft's server side, such as an expired license, a suspended account, or a temporary block on the authentication service.

Login & Account Issues