Sign-in & Login Problems

Fix Microsoft 365 on Mac Redirecting to an Old Tenant

Olivia Miller Oct 9, 2026 869 views

Question details

The user needs to prevent Microsoft 365 apps on their Mac from repeatedly redirecting to an old CSP tenant following a domain migration.

How to Fix Microsoft 365 on Mac Redirecting to an Old Tenant

Product: Microsoft 365 (Office, Teams, Outlook, Edge)
Device & OS: Mac
Scenario: Attempting to sign in to Microsoft 365 applications on a Mac after migrating to a new tenant.
Observed behavior: Authentication redirects to the old tenant despite the user removing old credentials from the Mac Keychain.

Before you start

Before modifying your Microsoft 365 licenses, ensure you back up your important Outlook data and account settings to prevent accidental data loss during the troubleshooting process.

Solution 1Recommended

Use the Microsoft Office License Removal Tool

This is the most effective method to clear inactive licenses and stale tenant information without disrupting your other active Office accounts.

When a standard Keychain clearing fails, hidden license files may still retain your old CSP tenant information. The official license removal tool safely targets these stale files.

Clear browser cache

Open Edge or your default browser, navigate to the settings, and clear your browser cache and cookies to remove old session tokens.

Download the tool

Download the official Office License Removal Tool for Mac from the Microsoft Support website.

Run the removal tool

Execute the tool to strip away the inactive license associated with the migrated domain. This process typically takes just a few minutes.

Sign in with current account

Reopen your Microsoft 365 applications (such as Outlook or Teams) and sign in using your new work account credentials.

Add migrated domain

Add the newly migrated domain to your affected applications to restore full functionality.

Use the Microsoft Office License Removal Tool

Tool Safety: The license removal tool is highly targeted. It generally removes only the inactive license and should restore working order within 20 minutes without affecting your other active Office licenses.

Solution 2

Clear Keychain Credentials Manually

A preliminary troubleshooting step to ensure no old cached credentials are forcing the login redirect.

Free Microsoft Office alternative

Manage Your Work Seamlessly with WPS Office

If you want to avoid complex tenant migrations, login loops, and license conflicts on your Mac, consider switching to WPS Office. It provides a lightweight, highly compatible alternative to Microsoft Office without the authentication headaches.

1. Download for Mac: Visit the official WPS website and download the macOS installer.
2. Install and launch: Install the application and open it without needing complex tenant configurations.
3. Open existing files: Drag and drop your existing Microsoft Office files to continue working seamlessly.

Fully compatible with Microsoft Word, Excel, and PowerPoint formats.No complex tenant or license management required.Lightweight software that runs efficiently on macOS.Free to download with essential office tools built-in.

microsoft office alternative - wps office

Frequently Asked Questions

Will the Office License Removal Tool delete my Outlook emails?

No, the tool only removes the software license files and stale tenant data. However, it is always recommended to back up your Outlook data and archive files before running system tools.

Why didn't deleting Keychain items fix the old tenant redirect?

Sometimes, Mac Keychain alone doesn't hold all the authentication tokens. Hidden license files and browser cache can still retain the old CSP tenant information, which is why the License Removal Tool is necessary.

Can I run multiple active Office accounts on Mac without conflicts?

Yes, Microsoft 365 on Mac supports multiple accounts. When you use the License Removal Tool, it isolates and removes only the inactive or migrated license, leaving your other active accounts untouched.

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