Microsoft 365 Alert – Service Degradation – SharePoint Online – Users may be unable to edit pages using SharePoint Designer – RESOLVED

Announcements Arpan Das

19/05/2026 09:15:00 AM

NHSmail Reference: INC46830022

Microsoft Reference: SP1314602

Issue Status: RESOLVED

Issue Description: Users may be unable to edit pages using SharePoint Designer.

More info: Due to issues with the SharePoint Online Designer API, impacted users will need to utilize the following steps for updating SharePoint Online pages.

1. Ensure the DenyACP aka NoScript security protection is currently off for the site
2. Download the ASPX file
3. Make edits to the aspx file as necessary using a text editor other than SP Designer or Visual Studio.
4. Upload the ASPX file

Please note that step four will be impacted by the Support for Content Security Policy (CSP) in SharePoint Online, of which more details can be found at the following link:
https://learn.microsoft.com/en-us/sharepoint/dev/spfx/content-securty-policy-trusted-script-sources

Final Update: 19/05/2026 09:46:00 AM–Microsoft has determined that the API that allows editing within SharePoint Online Designer entered a problematic configuration state preventing us from restoring it. Users will need to utilize the steps outlined in the More Info portion of this communication for updating SharePoint Online pages. Users continuing to encounter problems editing SharePoint Online pages should contact one of their support representatives so they can continue their investigation into the problem.

Scope of impact: This issue may prevent any user from editing SharePoint Online pages using SharePoint Designer.