Sign-in & Login Problems

Fix Office Sign-In When Work or School Email is Not Found

Emma Brown Sep 28, 2026 869 views

Question details

The user is unable to sign into Microsoft Office because the system incorrectly reports that their work or school email address cannot be found.

How to Fix Office Sign-In When Work or School Email is Not Found

Product: Microsoft Office
Device & OS: Windows
Scenario: Attempting to sign into Office applications on a personal computer using a work or school account tied to an active subscription.
Observed behavior: An error message appears stating the work or school email address cannot be found, preventing the user from authenticating and accessing Office applications.

Before you start

Ensure you have your correct work or school account credentials available, and remember to save any open documents before closing Office applications or modifying system settings.

Solution 1Recommended

Clear Saved Credentials and Remove Connected Accounts

Removing outdated or conflicting login tokens from Windows Credential Manager is the most effective way to resolve account recognition issues.

Windows often caches login credentials to make signing in faster. However, if these cached credentials become corrupted or conflict with your current subscription status, Office may fail to locate your active work or school account.

Remove Connected Accounts

Navigate to Windows Settings > Accounts > Email & accounts. Locate any old or unnecessary connected work or school accounts, click on them, and select 'Remove' or 'Disconnect'.

Sign Out of Office

Open any Office application like Word or Excel, click on your profile picture or name in the top right corner, and select 'Sign out'. Once signed out, close all Office applications.

Clear Windows Credential Manager

Click the Windows Start menu, type 'Credential Manager', and press Enter. Select 'Windows Credentials', scroll down to the 'Generic Credentials' section, and remove any entries that contain 'MicrosoftOffice' or 'mso'.

Clear Saved Credentials and Remove Connected Accounts

Restart Required: After clearing the credentials, restart your computer before attempting to sign into Microsoft Office again to ensure all cache is flushed.

Solution 2

Run an Office Quick Repair or Online Repair

If clearing credentials does not work, repairing the Office installation can fix underlying background services responsible for authentication.

Solution 3

Reset the Office Registry Settings

As a last resort, resetting the user-specific Office registry keys forces the software to rebuild its configuration files from scratch.

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Frequently Asked Questions

Why does Office say my work or school account doesn't exist?

This typically occurs if the email is typed incorrectly, the account has been deactivated by your organization's IT administrator, or there is a local caching issue where Windows Credential Manager is storing outdated login tokens that conflict with your current login attempt.

Will clearing Windows Credential Manager delete my Office files?

No. Clearing credentials only removes saved authentication tokens used to log you in automatically. Your personal documents, spreadsheets, and presentations saved locally or on cloud storage remain perfectly safe and untouched.

How do I back up my registry before making changes?

To back up your registry, open the Registry Editor (regedit), click on 'Computer' at the very top of the left-hand navigation pane, click 'File' > 'Export', choose 'All' under the Export range, and save the .reg file to a secure location like your desktop.

Login & Account Issues