Permission & Access Issues

Fix SharePoint File Migration Error: Access to the Resource Is Prohibited

Olivia Miller Sep 28, 2026 869 views

Question details

User needs help resolving an access error while attempting to move files from private SharePoint group folders to an archive site via API.

Fix SharePoint File Migration Error: Access to the Resource Is Prohibited

Product: Microsoft SharePoint API
Device & OS: not provided
Scenario: Migrating files from private SharePoint group folders to archive sites using SharePoint API endpoints via Postman.
Observed behavior: The API request fails in Postman with an 'Access to the resource is prohibited' error, preventing the file migration process.

Before you start

Verify that your user account or application has active Site Collection Administrator rights for both the source private group folder and the destination archive site before testing your API calls.

Solution 1Recommended

Verify API Permissions and Escalate to Microsoft Q&A

Since this involves advanced API endpoints and authentication limitations, checking your app permissions and escalating to Microsoft specialists is the recommended approach.

SharePoint API migration errors typically stem from insufficient app scopes, expired bearer tokens, or misconfigured Graph API endpoints. If standard token refreshes do not resolve the issue, specialized support is required.

Verify Your Bearer Token

In Postman, check your 'Authorization' tab to ensure your Bearer token is properly formatted, active, and has not expired.

Check App Registration Permissions

Log into your Azure Portal or SharePoint Admin Center to confirm that your registered application has 'Sites.ReadWrite.All' or the specific scopes required for file migration across both sites.

Validate the Endpoint URL

Ensure that the API endpoint URL entered in Postman exactly matches the latest Microsoft Graph or SharePoint REST API documentation for moving files.

Post in Microsoft Q&A

If the error persists, navigate to https://learn.microsoft.com/en-us/answers/questions/. Create a new post detailing your endpoint, authentication method, and permissions to get specialized Microsoft assistance.

Verify API Permissions and Escalate to Microsoft Q&A

Security Reminder: When asking for help in public forums like Microsoft Q&A, never include sensitive information such as your actual Bearer tokens, client secrets, or tenant IDs in your error logs.

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Frequently Asked Questions

Why does the SharePoint API return an 'Access Prohibited' error in Postman?

This typically happens if your OAuth token lacks the required scopes (like Sites.ReadWrite.All), if the token has expired, or if the account executing the API call does not have permissions granted to the specific private group folder.

How can I check if my API authentication token is still valid?

You can decode your JWT (JSON Web Token) using secure online decoding tools to view the 'exp' (expiration) claim. Alternatively, generate a fresh token in Postman and re-send the request to rule out expiration issues.

Can WPS Office resolve my SharePoint file migration errors?

No, SharePoint API migration errors are specific to the Microsoft ecosystem and access policies. WPS Office is a highly compatible document editor for opening and managing the files themselves, but backend server migrations must be handled via Microsoft's tools and support.

Document & File Issues