Copilot Button Disappeared From Office Apps After Update: Fix

After a recent Microsoft 365 update, the Copilot button may vanish from the ribbon in Word, Excel, PowerPoint, or Outlook. This happens because the update resets certain add-in or feature settings, or because your Microsoft 365 subscription license was temporarily disconnected. The Copilot button is controlled by a combination of licensing, service connectivity, and a specific registry or group policy setting. This article explains the root cause of the disappearance and provides a step-by-step fix to restore the Copilot button in all affected Office apps.

Why the Copilot Button Disappears After an Office Update

The most common cause is that a feature update to Microsoft 365 Apps for enterprise resets the ExperimentConfigs registry key. This key stores the feature flags that Microsoft uses to enable or disable Copilot for individual apps. When the update runs, it may delete or overwrite the ExternalFeatureOverrides subkey, which contains the DWORD value that forces Copilot to appear. Without this value, the Office app reverts to its default behavior and hides the Copilot button.

License and Connectivity Issues

A secondary cause is a temporary loss of license synchronization. After an update, the Office client rechecks the user’s subscription. If the license check fails because of a network issue or a cached credential problem, the client treats the user as unlicensed and disables Copilot. The same occurs if the user’s Microsoft 365 account was signed out during the update process.

Group Policy or Configuration Profile Conflicts

In managed environments, an IT administrator may have deployed a group policy that disables Copilot. The update can reapply this policy if the policy setting was changed or if the client machine re-syncs with the domain controller after the update. This is less common but affects enterprise tenants using Microsoft Intune or Group Policy Management Console.

Steps to Restore the Copilot Button in Office Apps

Follow these steps in order. Test the Copilot button after each step before moving to the next.

1. Sign Out and Sign Back Into Office
   Open any Office app such as Word. Go to File > Account. Under User Information, click Sign Out. Wait 10 seconds, then click Sign In and enter your Microsoft 365 work or school account credentials. This forces the client to re-authenticate and re-sync your Copilot license.
2. Run Office Updates Manually
   In the same File > Account screen, click Update Options and then Update Now. Wait for the update to complete and restart the app. The update may re-register the Copilot add-in and restore the missing button.
3. Enable the Copilot Add-in in COM Add-ins
   Go to File > Options > Add-ins. At the bottom, next to Manage, select COM Add-ins and click Go. In the list, check Microsoft Copilot if it appears. If it is missing, click Add and browse to C:\Program Files\Microsoft Office\root\Office16\Microsoft.Copilot.Addin.dll. Click OK and restart the app.
4. Modify the Registry to Force Copilot Visibility
   Press Windows Key + R, type regedit, and press Enter. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\ExperimentConfigs\ExternalFeatureOverrides\word. If the word key does not exist, right-click ExternalFeatureOverrides, select New > Key, and name it word. Inside the word key, right-click the right pane, select New > DWORD (32-bit) Value, and name it Microsoft.Copilot.Dev. Set its value to 1. Repeat for excel, powerpoint, and outlook keys under ExternalFeatureOverrides. Close Registry Editor and restart the Office app.
5. Run the Microsoft Support and Recovery Assistant
   Download and run the Microsoft Support and Recovery Assistant (SaRA) from the Microsoft website. Select Office > Office and Microsoft 365 apps. Follow the on-screen prompts to detect and fix Copilot-related issues. SaRA can reset the Office activation state and repair missing registry entries.
6. Repair Office Installation
   Open Control Panel > Programs and Features. Right-click Microsoft 365 Apps for enterprise and select Change. Choose Quick Repair first. If the Copilot button does not reappear, run Online Repair. This reinstalls all Office components without affecting your files.

If Copilot Still Has Issues After the Main Fix

Copilot Button Appears but Shows an Error When Clicked

This indicates a connectivity problem with the Copilot service. Open a web browser and go to copilot.microsoft.com. Sign in with the same account. If the web version works, the issue is with the Office app’s cached data. Clear the Office cache by closing all Office apps, pressing Windows Key + R, typing %localappdata%\Microsoft\Office\16.0\OfficeFileCache, and deleting all files in that folder. Restart the app.

Copilot Button Disappears Only in Outlook

Outlook uses a separate add-in. Go to File > Options > Add-ins. Under Manage, select COM Add-ins and click Go. Check Microsoft Copilot for Outlook. If it is not listed, click Add and browse to C:\Program Files\Microsoft Office\root\Office16\Microsoft.Copilot.Outlook.Addin.dll. Restart Outlook.

Copilot Button Disappears for All Users in an Organization

The IT administrator must check the Microsoft 365 admin center. Go to Billing > Licenses and verify that each user has a Copilot license assigned. Then go to Settings > Org settings > Copilot and ensure that Allow Copilot in Office apps is set to On. If a group policy disables Copilot, remove the policy setting Turn off Copilot from the user’s configuration profile.

Copilot Button Disappeared After Update vs Copilot Not Working: Key Differences

Item	Copilot Button Disappeared After Update	Copilot Not Working
Description	The Copilot icon is missing from the ribbon or toolbar	The icon is present but clicking it produces no response or an error
Root cause	Registry key reset, add-in disabled, or license sync failure after update	Service outage, network proxy blocking, or corrupted user profile
Primary fix	Restore the ExternalFeatureOverrides registry key or re-enable the COM add-in	Check service health at admin center, clear cache, or run SaRA
User action	Modify registry or run Office repair	Test web version, check firewall, or reset app data

Understanding these differences helps you choose the correct troubleshooting path. If the button is missing, focus on registry and add-in steps. If the button is present but broken, focus on connectivity and service checks.

Now you can restore the Copilot button in Word, Excel, PowerPoint, and Outlook after a Microsoft 365 update. Start by signing out and back into Office, then run manual updates. If those steps fail, modify the ExternalFeatureOverrides registry key to force Copilot visibility. For persistent issues, run the Microsoft Support and Recovery Assistant or perform an Online Repair of Office. As a final check, verify that your IT administrator has not applied a group policy that disables Copilot for your entire organization.