Microsoft 365 Alert – Service Degradation – Microsoft Teams – Users who’ve had their microphone disabled in a meeting are still able to communicate in Microsoft Teams – RESOLVED

07/02/2023 16:42:00 PM (GMT)

NHSmail Reference : INC34209833

Microsoft Reference : TM512469

Issue Status : RESOLVED

Issue Description : Users who’ve had their microphone disabled in a meeting may still be able to communicate in Microsoft Teams.

More Information : Specifically, attendees whose microphones have been disabled by the organizer in meeting options may be able to communicate if re-joining with the microphone enabled. To prevent this, users should re-join the meeting with the microphone disabled.

Final Update : 08/02/2023 08:35:00 AM – Microsoft’s analysis of service monitoring telemetry, recent changes made to the service, and correlation IDs gathered from our internal reproduction of the issue confirms that impact was stemming from a recent service update which introduced a code regression to the infrastructure responsible for supporting some audio functionality within Microsoft Teams meetings. This in turn inadvertently prevented full application of meeting-wide user audio and microphone settings specific to users newly joining an existing structured Teams meeting event where restrictions are applied to attendee users. To resolve this issue, they routed traffic to alternate infrastructure (which hadn”t yet received the offending update) and confirmed resolution through monitoring service telemetry. 

Scope of impact : Impact is specific to some users who are served through the affected infrastructure.

Root cause : A recent service update introduced a code regression to the infrastructure responsible for supporting some audio functionality within Microsoft Teams meetings, resulting in impact.

Next steps : Microsoft are reviewing their update validation methodology to ensure similar code regressions aren’t introduced in future deployments.