Microsoft 365 Alert – Service Degradation – Microsoft Teams – Some users may experience latency and buffering when attending Microsoft Teams live events – RESOLVED

Announcements Arpan Das

16/09/2025 09:01:00 AM

NHSmail Reference: INC46630418

Microsoft Reference: TM1153612

Issue Status: RESOLVED

Issue Description: Users may experience latency and buffering when attending Microsoft Teams live events.

More info: The problem intermittently impacts some live events and is specific to attendees. Impacted attendees see a buffering spinning circle while attending live events and viewing previously recorded live events.

We recommend users to switch to Microsoft Teams town halls as they are not impacted.

All users that are using Microsoft Teams town halls will see Akamai as the Content Delivery Network (CDN) being used.

Final Update: 17/09/2025 08:25:00 AM – Microsoft have identified that a portion of the CDN infrastructure that serves Live Events performed below acceptable thresholds, increasing request latency for some streams and resulted in attendee buffering. To remediate this issue, their content delivery partners restored the performance of the CDN infrastructure, which successfully resolved the impact, and they’ve verified resolution with the affected users.

Root cause: A portion of the CDN infrastructure that serves Live Events performed below acceptable thresholds, increasing request latency for some streams and resulted in attendee buffering.

Scope of impact: Some users who are attending live events or viewing previous live events may be intermittently impacted.

Next steps: Microsoft are investigating why the portion of the CDN infrastructure that serves Live Events performed below acceptable thresholds to implement measures for preventing this problem from happening again in the future.