Users may not receive change notifications for Microsoft Teams in the Microsoft Graph API

Title: Users may not receive change notifications for Microsoft Teams in the Microsoft Graph API

User impact: Users may have not received change notifications for Microsoft Teams in the Microsoft Graph API.

Final status: We’ve identified that an imbalance of notification requests sent to the Graph API caused an uneven distribution load, resulting in impact. We’ve rebalanced traffic across alternate infrastructure and confirmed using our internal telemetry data that impact is remediated.

Scope of impact: Any user that expected to see Microsoft Teams change notifications in the Microsoft Graph API may have been impacted.

Start time: Thursday, April 4, 2024, at 8:00 AM UTC

End time: Thursday, April 4, 2024, at 5:00 PM UTC

Root cause: An imbalance of notification requests sent to the Graph API caused an uneven distribution load, resulting in impact.

Next steps:
– We’re reviewing the affected infrastructure to identify why it wasn’t able to handle the service traffic, potentially allowing us to create a fix that prevents similar impact from occurring in the future.

This is the final update for the event.