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How to Fix Microsoft 365 AADSTS90002 Tenant Not Found on Mac
Question details
The user is encountering an AADSTS90002 error on Mac because Office is retaining credentials from a deleted business tenant.
- Product
- Microsoft 365 for Mac
- Device & OS
- Mac
- Scenario
- Attempting to sign in with a new Microsoft 365 account or open documents after a previous business trial or tenant was deleted.
- Observed behavior
- Office applications fail to open documents or allow sign-ins, displaying the AADSTS90002 Tenant Not Found error. Reinstalling the apps does not resolve the issue, as the deleted business account remains associated with the Mac.
Ensure you have your correct Microsoft 365 Home or new business account credentials ready, as you will need to sign back in after clearing the old license data.
Use the Microsoft Office License Removal Tool
The most effective way to clear old tenant data is to use Microsoft's official license removal tool for Mac.
Reinstalling Microsoft Office does not remove hidden cache files. To completely dissociate the deleted business tenant from your Mac, you must clear the licensing data securely using the dedicated removal tool.
Visit the official Microsoft Support website and download the Office License Removal Tool for Mac.
Open the downloaded .pkg file and follow the on-screen prompts to install and run the tool. It will automatically detect and remove existing Office licenses.
Restart your Mac. Open any Office application, such as Word, and sign in with your correct Microsoft 365 account credentials.
Clear Obsolete Office Credentials from iCloud Keychain
Manually remove lingering business account credentials stored in your Mac's Keychain Access if the removal tool fails.
Try WPS Office for Mac to Avoid Account Errors
If persistent Microsoft 365 tenant errors are preventing you from accessing your work, consider switching to WPS Office. It provides a lightweight, hassle-free environment to view and edit all your Office documents without complex account management issues.
- 1. Download WPS Office: Visit the official WPS website and download the installer tailored for macOS.
- 2. Install the application: Open the downloaded file and drag the WPS Office icon to your Applications folder.
- 3. Work instantly: Launch WPS Office and directly open your existing Microsoft Office files without worrying about tenant sign-in errors.
Frequently Asked Questions
Why does reinstalling Microsoft Office on Mac not fix the AADSTS90002 error?
Reinstalling simply replaces the application files. The cached license files and saved login credentials remain stored in your Mac's Library folder and Keychain, causing the app to continue referencing the deleted tenant.
Will running the license removal tool delete my Word documents?
No, the removal tool only clears activation data and cached account credentials. All your personal documents, spreadsheets, and presentations will remain completely safe on your Mac.
What if the AADSTS90002 error still occurs after using the tool?
If the deleted tenant continues to appear, manually open your Mac's Keychain Access app, search for "Office" and "ADAL", and delete those credential entries. If the issue persists, you may need to contact Microsoft Support to unlink your device server-side.
Where can I download the Office License Removal Tool?
You can download the official Office License Removal Tool directly from the Microsoft Support website by searching for "How to remove Office license files on a Mac".
