Microsoft 365 Alert – Service Degradation – Microsoft Teams – When anonymous users send a message to a meeting chat, the sent user ID doesn’t match with the logged in user ID – RESOLVED

20/04/2023 09:03:00 AM (GMT)

NHSmail Reference : INC35419048

Microsoft Reference : TM543951

Issue Status : RESOLVED

Issue Description : When anonymous users send a message to a meeting chat, the sent user ID doesn’t match with the logged in user ID.

More Information : Impact is specific to anonymous users within meetings which have 80 or more attendees.

Final Update : 24/04/2023 09:25:00 AM – Microsoft have confirmed through monitoring service telemetry that reverting the previously mentioned update effectively resolved the issue.

Scope of impact : Any anonymous users within meetings which have 80 or more attendees may be impacted.

Root cause : A recent service update has inadvertently impacted the anonymous users within meetings which have 80 or more attendees.

Next steps : Microsoft are assessing their update validation methodology to ensure similar issues are identified and remediated prior to deployment. They’re seeking to correct the problem within the update they reverted so it can ultimately be redeployed without issue.

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