We have monitored the service for stability and this incident shall now be closed.
We have identified the cause of the issue and have implemented a fix. We will now monitor the service for stability and provide updates as soon as new information becomes available.
We are aware of an issue with degradation in isolated browsing experience since January 22, 2025, 05:30 UTC for tenants that run on Web Isolation version 1-16-121.
Specifically, video elements may not load, and isolated documents are not presented properly.
We have identified the cause of the issue and will deploy a fix to affected tenants at 10:00 UTC. End users who are actively browsing in an isolated session may experience a tab refresh when the fix is published.
We will continue to provide updates as more information becomes available.