Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users’ Microsoft Teams Webinar registration confirmation email messages are delayed up to three hours – RESOLVED

Announcements Shagufta Naaz

04/06/2026 08:53:00 AM

NHSmail Reference: INC46842490

Microsoft Reference: TM1333683

Issue Status: RESOLVED

Issue Description: Users’ Microsoft Teams Webinar registration confirmation email messages are delayed up to three hours.

More info: Impact typically occurs for one to three hours between the time frame of 1:00 PM UTC to 11:00 PM UTC.

Final Update: 09/06/2026 08:48:00 AM – Microsoft applied their targeted fixes to improve webinar registration confirmation email message delivery performance, they conducted an extended period of monitoring and validated through telemetry that the delays are no longer occurring and the impact is remediated.

Scope of impact: Your organization is impacted by this event, and some users expecting to receive Microsoft Teams webinar registration confirmation email messages are impacted.

Root cause: An increase in request traffic to the portion of service infrastructure responsible for facilitating Webinar registration confirmation email messages which is causing delays when delivering them to end users.

Next Steps: Microsoft are continuing to monitor service health telemetry to ensure there are no further disruptions to email message delivery and there are no additional actions needed to prevent this from reoccurring.