Microsoft Sentinel: Loading Data Issues in Defender Portal — Ongoing Investigation

Question

Problem description

I am experiencing issues accessing Microsoft Sentinel features through the Defender portal. Since September 3, 2026, all Sentinel features such as Content Hub, Analytics, Automation, Logs, and Hunting immediately redirect back to the Workspaces overview page without any specific error messages.

Environment

The affected environment is a Log Analytics workspace enabled for Microsoft Sentinel, deployed in an Australia-region subscription. Sentinel is connected as the Primary workspace in the Microsoft Defender portal.

What I've already tried

I confirmed the workspace's binding status in the Defender portal, verified that it shows as Connected and Primary. Support retrieved diagnostic logs related to Sentinel onboarding; no relevant errors were found. I have not performed additional configuration changes or role verifications beyond these steps.

Current status

I am seeking guidance on further troubleshooting steps to resolve the redirect issue and restore full functionality of Microsoft Sentinel features in the Defender portal.