Office Settings & Configuration

Fix Excel Add-In Cannot Connect to Office Store Catalog Error

Camila Milosovich Sep 27, 2026 872 views

Question details

The user is unable to use a previously functioning Excel add-in due to a server connection error.

How to Fix Excel Add-In Connection to Office Store Catalog

Product: Microsoft Excel
Device & OS: not provided
Scenario: Opening a workbook stored in a personal OneDrive and attempting to use an installed add-in.
Observed behavior: Excel displays an error message stating that it cannot connect to the Office Store catalog server for the add-in.

Before you start

Verify that your computer has a stable internet connection and that no firewall or antivirus software is blocking Excel from accessing online services.

Solution 1Recommended

Restart Excel and Test Alternative Add-ins

Restarting the application can resolve temporary network handshakes and help identify if the issue is isolated to a single add-in.

Often, a simple restart will force Excel to re-authenticate with Microsoft's servers and re-establish a connection to the Office Store.

Close the Workbook

Save any unsaved changes to your OneDrive workbook and close Microsoft Excel completely.

Reopen Excel

Launch Microsoft Excel again and open a new blank workbook.

Access Add-ins

Navigate to the 'Insert' tab on the top ribbon and click on 'Get Add-ins' to check if the store interface loads properly.

Test Functionality

Try enabling a different add-in to see if the connection error is universal or limited to the previously used add-in.

Restart Excel and Test Alternative Add-ins

Solution 2

Report the Problem to Microsoft Support

If multiple add-ins fail to load, the issue is likely a temporary Microsoft service outage that requires reporting.

Free Microsoft Office alternative

Try WPS Office for a Reliable Spreadsheet Experience

If server errors and Microsoft Office Store outages frequently disrupt your workflow, consider switching to WPS Office. It provides a lightweight, highly compatible alternative for creating, editing, and managing your spreadsheets without relying on Microsoft's cloud infrastructure.

1. Download WPS Office: Visit the official WPS website and download the free WPS Office installer for your operating system.
2. Install the Software: Run the downloaded installer and follow the simple on-screen instructions to complete the setup.
3. Open Your Spreadsheets: Launch WPS Spreadsheet and open your existing Excel workbooks instantly without losing any formatting.

Free and lightweight Office suite for everyday tasksFully compatible with Microsoft Excel formats (.xlsx, .xls, .csv)Stable offline performance without relying on Office Store serversFamiliar user interface allowing for instant and seamless migration

microsoft office alternative - wps office

Frequently Asked Questions

Why does Excel say it cannot connect to the Office Store catalog?

This error typically occurs due to a temporary server outage on Microsoft's end, local network connectivity issues, or a temporary glitch with your Microsoft account authentication.

Is my OneDrive workbook safe if the add-in fails to load?

Yes. Add-in connection errors are entirely related to external server communication. Your data and workbook saved on personal OneDrive remain secure and intact.

How can I check if the Office Store server is down?

You can verify the Microsoft 365 Service health status on the official Microsoft portal, or try loading different add-ins within Excel. If all add-ins fail, it strongly indicates a server-side outage.

Office App Problems