SharePoint /Onedrive is not rendering documents in isolation

Products

• Web Isolation

Issue/Introduction

When you open office documents(word, excel, powerpoint, etc.) in sharepoint or in onedrive, they do not get opened in isolation.

Cause

Sharepoint and onedrive open document files in their own UI. So, it is not considered as a document file by the browser.
While for regular doc files, they are opened in isolated UI of docisolation.prod.fire.glass.
So, this behavior is expected.

Resolution

This is expected behavior