Some users may be unable to load their calendar in the Microsoft Teams web app

Title: Some users may be unable to load their calendar in the Microsoft Teams web app User impact: Users may be unable to load their calendar in the Microsoft Teams web app. Final status: The investigation is complete and we've determined the service is healthy. A service incident didn't actually occur. This communication will expire in 24 hours. This is the final update for the event.

Title: Some users may be unable to load their calendar in the Microsoft Teams web app User impact: Users may be unable to load their calendar in the Microsoft Teams web app. More info: Affected users may experience extended loading times, and subsequent attempts to load their calendar may succeed. Current status: We're continuing our comparison of the failed and successful attempts to load the calendar in the Microsoft Teams web app to better understand the flow latency and identify a strategy that remediates impact. Scope of impact: Some users attempting to load their calendar in the Microsoft Teams web app may be impacted. This information may be updated as our investigation continues. Next update by: Wednesday, October 28, 2026, at 12:00 AM UTC

Title: Some users may be unable to load their calendar in the Microsoft Teams web app User impact: Users may be unable to load their calendar in the Microsoft Teams web app. More info: Affected users may experience extended loading times, and subsequent attempts to load their calendar may succeed. Current status: We've identified latencies in a specific flow that result in timeout failures, potentially contributing to the reported impact. We're comparing failed and successful attempts from our internal telemetry data to better understand the flow latency and identify a strategy that remediates impact. Scope of impact: Some users attempting to load their calendar in the Microsoft Teams web app may be impacted. This information may be updated as our investigation continues. Next update by: Tuesday, October 27, 2026, at 8:00 PM UTC

Title: Some users may be unable to load their calendar in the Microsoft Teams web app User impact: Users may be unable to load their calendar in the Microsoft Teams web app. More info: Affected users may experience extended loading times, and subsequent attempts to load their calendar may succeed. Current status: We’re continuing our review of the service monitoring telemetry and system logs to isolate the root cause and develop a remediation strategy. Scope of impact: Some users attempting to load their calendar in the Microsoft Teams web app may be impacted. This information may be updated as our investigation continues. Next update by: Tuesday, October 27, 2026, at 6:00 PM UTC

Title: Some users may be unable to load their calendar in the Microsoft Teams web application User impact: Users may be unable to load their calendar in the Microsoft Teams web application. More info: Affected users may experience extended loading times, and subsequent attempts to load their calendar may succeed. Current status: We’re reviewing service monitoring telemetry and system logs to isolate the root cause, in order to develop a remediation plan. Scope of impact: Some users attempting to load their calendar in the Microsoft Teams web application may be impacted. This information may be updated as our investigation continues. Next update by: Tuesday, October 27, 2026, at 4:00 PM UTC