How can I fix the issue where I cannot edit or create new files in shared SharePoint folders from the Windows 11 desktop?

I’m answering your questions:

Does this affect all users working in the same shared library or only some?

It affects all users who work with that shared library.

You mentioned that you couldn’t modify or create new files in the SharePoint shared folder; when you tried to make changes or add a file, what exactly happened? Did you see any error message or did nothing occur?

When creating new files, a Windows notification appears saying that access to the folder is denied and asks to provide administrator permissions. When modifying an existing file, the same notification appears saying that access to the folder is denied and asks to provide administrator permissions.

These messages appear when working in the Windows 11 environment, that is, locally with access to the SharePoint folder. When you try to perform the same actions through the web application, there is no problem doing so.

Do the problems mainly affect Office files (Word/Excel/PowerPoint), OneNote notebooks, etc.?

The problems affect any type of file. I have tried pasting a .pdf or other files with different extensions, and I get the notification that I need administrator permissions. The same happens if I want to edit other files that are not Office extensions.

Does this only happen to site members or also to the site owner? If the site owner is not affected, can they reproduce the problem locally?

The problem happens to all members and site owners.

This problem only occurs with one specific folder. There are many other folders within SharePoint that we have access to, and this issue does not happen with them.

Dear @Juan Manuel,

Thank you for your detailed information!

May I ask if you and the affected users have had time to try out the steps that I suggested above?

If the issue persists after doing those steps, it would indicate that this needs to be investigated further by creating a support ticket with a Technical Support Engineer via a remote session to check if there's an issue with backend.

Therefore, if there are any updates or if you still need assistance, I’m more than happy to help. 

Looking forward to hearing how things are progressing whenever you have a chance!

Thank you for your time and attention.

Dear @Juan Manuel,

Good day! I hope everything is going well on your end.

It’s been a little while, so I just wanted to follow up and see how things are progressing with your concern. If you've run into any challenges or if there's anything further that I can help with, please don’t hesitate to let me know. Any updates you’re able to share would be greatly appreciated.

Thanks again for your time and attention! I look forward to hearing from you.

Dejar Julie, We're still having the same problem. We've escalated the issue to our IT team. We hope to resolve it soon. If you have any ideas, I would appreciate it. Thank you.

Dear @Juan Manuel,

Thank you for letting me know.

In the meantime, please follow the guidance provided by your admin first, as they may have steps to help resolve the issue.

If the problem persists after that, I recommend submitting a support ticket so the backend team can investigate further and work on a fix.

As forum moderators, we don’t have access to the detailed logs or backend systems needed to troubleshoot this effectively due to privacy and security constraints. For that reason, the most efficient solution would be to contact Microsoft’s support team directly.    

Ticket Support: In the Microsoft 365 Admin Center > Support > Help & Support.

You can raise support ticket at: https://admin.microsoft.com/#/support/requests    

Here’s what your Office 365 Global Admin should do next if the same issue happens:  

Submit a Service Request: The Global Admin should create a service request with Microsoft support to get advanced technical assistance and diagnostics. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin. 

If there are any updates or if you still need assistance, I’m more than happy to help. 

Looking forward to hearing how things are progressing whenever you have a chance!