Copilot Permission Problems

Fix Copilot File Uploads Disabled by Administrator (Error AADSTS900561)

Maira Mehtab Sep 22, 2026 869 views

Question details

The user is unable to upload files to Microsoft Copilot because the feature is blocked by an administrator, and sign-in fails with error code AADSTS900561.

Product: Microsoft Copilot
Device & OS: not provided
Scenario: Attempting to sign in and upload files to Microsoft Copilot within an organizational environment.
Observed behavior: Copilot blocks the file upload with a message stating the feature is disabled by an administrator, and displays error AADSTS900561 during the sign-in process.

Before you start

Ensure you have access to your organization's IT helpdesk or system administrator contact information, as resolving Entra ID authentication errors requires administrative privileges.

Solution 1Recommended

Contact Your IT Administrator

Use this solution to report the organization-level block to the person who manages your Microsoft Entra ID tenant.

Error AADSTS900561 and disabled file uploads typically mean that your organization's security policies restrict AI features and file sharing. Only an administrator with access to the Microsoft 365 admin center and Microsoft Entra ID can modify these permissions.

Document the Error Details

Take note of the exact error code (AADSTS900561) and the specific Microsoft account you are using to sign in.

Reach Out to IT Support

Contact your company's IT helpdesk or system administrator to report that Copilot file uploads are blocked.

Request Configuration Review

Ask the administrator to review the Microsoft Entra ID authentication settings and Copilot service configurations for your user group.

Policy Restrictions: Administrators may intentionally disable file uploads in Copilot to comply with internal data privacy and security regulations.

Solution 2

Seek Assistance in the Microsoft Community

If you are an administrator or need further investigation from Microsoft's service team, post your issue on the official community forums.

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Frequently Asked Questions

What does Microsoft error AADSTS900561 mean?

Error AADSTS900561 indicates an issue with Microsoft Entra ID (formerly Azure AD) authentication or session state. It often requires re-authenticating your session or having an administrator adjust tenant sign-in policies.

Can I bypass the administrator restriction on Copilot file uploads?

No. If your organization's IT department has disabled file uploads in Copilot through Microsoft Entra ID policies for security reasons, only a network administrator can re-enable the feature for your account.

Does WPS Office have an AI feature similar to Microsoft Copilot?

Yes, WPS Office includes WPS AI, a powerful built-in assistant that can help you write documents, summarize lengthy PDFs, and analyze spreadsheet data directly within the software suite.

Why are my tenant settings blocking Copilot?

Administrators frequently configure tenant settings in Microsoft Entra ID to restrict external file sharing and cloud-based AI data processing to ensure the organization complies with corporate data privacy and security policies.

Microsoft Copilot Issues