Office Settings & Configuration

How to Fix Excel ChatGPT Add-In Catalog Connection Error

John WilsonJohn Wilson Oct 19, 2026 869 views

Question details

Users are unable to install the ChatGPT for Excel add-in and encounter an error preventing them from connecting to the Microsoft catalog.

How to Fix the Excel ChatGPT Add-In Catalog Connection Error
Product
Microsoft Excel
Device & OS
not provided
Scenario
Installing and trusting the ChatGPT add-in from the Office Store or Microsoft AppSource.
Observed behavior
When clicking the 'Trust this add-in' button, Excel returns the error message: 'We cannot load this add-in because we could not connect to the catalog.'
Before you start

Before attempting any fixes, ensure your device has a stable internet connection and temporarily pause any strict third-party antivirus software or VPNs that might be blocking Microsoft's network traffic.

Solution 1Recommended

Verify Microsoft Account and Add-in Permissions

Ensure you are logged into Excel with the correct Microsoft account and have the necessary administrative permissions to access the AppSource catalog.

Catalog connection errors often occur when the Microsoft account currently signed into Excel does not match the account that holds the Office license, or when the account lacks permission to download third-party add-ins.

1
Check Signed-in Account

Open Microsoft Excel, navigate to 'File' and click on 'Account'. Verify that you are signed in with the Microsoft account associated with your Office license.

2
Access Built-in Add-in Store

Instead of using external web links, go to the 'Insert' tab on the Excel ribbon and click on 'Get Add-ins'.

3
Search for the Add-in

In the Office Add-ins window, select 'Store', type 'ChatGPT' into the search bar, and attempt to add it directly from the interface.

Verify Microsoft Account and Add-in Permissions
Admin Permissions Required: If you are using a work or school account, your organization's IT administrator may have disabled access to the Office Store. You will need to contact them to request access.
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Frequently Asked Questions

Why do I get a catalog connection error when trusting the ChatGPT add-in?

This error typically occurs when Excel is unable to communicate with the Microsoft AppSource store. Common culprits include proxy or VPN interference, strict firewall rules, lack of administrative permissions, or logging into Excel with an account that doesn't match the Office license.

Does the ChatGPT add-in work on older versions of Excel?

The ChatGPT add-in officially requires Excel 2016 or later. However, some older perpetual licenses (like Office 2016 or 2019) may have outdated security protocols or limited AppSource support, which can cause connection failures. Updating your Office application to the latest build can help.

How can I fix add-in catalog errors on a company computer?

If you are on a managed company or school device, your organization's IT department likely restricts Office Store access for security reasons. You will need to contact your Microsoft 365 administrator and request that they whitelist the add-in or deploy it centrally via the Microsoft 365 Admin Center.