Copilot Permission Problems

Fix BizChat Copilot Agent Cannot Access Excel Files in SharePoint

WPS Content Manager Sep 28, 2026 869 views

Question details

A Copilot agent created in BizChat is unable to access an Excel file hosted on SharePoint, and the attachment button appears disabled.

How to Fix BizChat Copilot Agent Cannot Access Excel Files in SharePoint

Product: Microsoft Copilot / SharePoint
Device & OS: not provided
Scenario: Trying to use a BizChat Copilot agent to analyze or interact with an Excel file stored in a SharePoint document library.
Observed behavior: The Copilot agent fails to access the file, and the file attachment button is disabled, likely due to restricted permissions or organizational policies.

Before you start

Ensure you have the necessary site owner or Microsoft 365 administrator privileges to review and modify access permissions for the affected SharePoint document library.

Solution 1Recommended

Verify User and Copilot Agent Permissions in SharePoint

Ensure both the user and the Copilot agent have the required access levels to read the SharePoint site, document library, and the specific Excel file.

Copilot respects your existing SharePoint access controls. If a user or the agent lacks permission to view a file, Copilot will block access and disable the attachment option.

Access Site Permissions

Navigate to the SharePoint site where the Excel file is stored, click on the Settings gear icon in the top right corner, and select 'Site permissions'.

Check Advanced Settings

Click on 'Advanced permissions settings' to view the detailed access list. Ensure the affected user is listed with at least 'Read' access.

Manage File-Specific Access

Locate the specific Excel file in the document library, click the three dots (More options) next to it, and select 'Manage Access'. Verify that there are no restricted sharing links or unique permissions blocking the agent.

Verify User and Copilot Agent Permissions in SharePoint

Permission Propagation Delay: After granting new permissions, it may take some time for the changes to propagate and for Copilot to recognize the updated access rights.

Solution 2

Review Organizational Sharing Policies and Admin Settings

Check if tenant-level policies in the Microsoft 365 admin center are blocking Copilot from accessing SharePoint data or attachments.

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Frequently Asked Questions

Why is the attachment button disabled in BizChat Copilot?

The attachment button may be disabled if the Copilot agent has not been granted access to the specific SharePoint site, or if your organization's IT policies restrict attaching files from external or protected libraries.

How do I grant Copilot agent access to a specific SharePoint folder?

You must ensure that the SharePoint folder's permission settings allow access to the agent. Navigate to the folder, click 'Manage Access', and verify that the user's scope and the Microsoft 365 Copilot application have the necessary read/write permissions.

Where can I get help if my Copilot agent still cannot read SharePoint files?

If adjusting site and file permissions does not work, it is recommended to post your issue on the Microsoft Q&A platform with the 'Microsoft Copilot' tag, or contact your Microsoft 365 administrator to check tenant-wide security policies.

Microsoft Copilot Issues