Cross-domain iframe requests to SharePoint Online organizations are blocked.
This issue occurs when one of the following conditions is true:
- You're displaying SharePoint Online pages on an external site through an iframe.
- You're displaying SharePoint Online pages on a SharePoint Online site that uses a different domain through an iframe.
Article ID: 2795602 - Last Review: Dec 28, 2016 - Revision: 1
Microsoft SharePoint Online