Microsoft 365 のサービス正常性（TM495986）にて、Microsoft Teams のメッセージの送受信に遅延が発生、チャットやチャネルの作成が行えないことがある SI（サービス インシデント）が発生しています。

“TM495986” のサマリー

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Users may be unable to send and receive messages in Microsoft Teams chats or channels – TM495986

サービス：Microsoft Teams

状態：Service restored

ユーザーへの影響：Users may be unable to send and receive messages in Microsoft Teams chats or channels.

Microsoft 365 のサービス正常性（TM495986）にて、Microsoft Teams のメッセージの送受信に遅延が発生、チャットやチャネルの作成が行えないことがある SI（サービス インシデント）になります。

本事象の影響を受けているユーザーでは、Microsoft Teams のチャットまたはチャネルでメッセージの送受信が行えない可能性があります。

現在、サービスを提供するインフラストラクチャーのモニタリングおよびユーザーからの報告により、本事象が改善していることを確認しています。

この問題は、バックエンドのデータベースの遅延の問題が、Microsoft Teams のメッセージ送信サービスでタイムアウトを引き起こしていたことにより発生していました。

現在も、データベースの遅延の問題となった根本的な原因の調査を行っており、詳細については、PIR（Post – Incident Report）にて報告予定となっています。

今後は、データベースの引き起こした根本的な原因を特定し、事象発生時に適切に確認が行えるようにするためモニタリングの手順を見直す予定とのことです。

この問題は、Microsoft Teams デスクトップ クライアント、Microsoft Teams ブラウザー版、Microsoft Teams モバイル アプリから該当機能を利用しようとするすべてのユーザーに影響している可能性があります。

Incident Information

Glossary

• Cosmos Database (DB) – Azure Cosmos DB is a fully managed Non-SQL and relational database for modern app development.
• Azure Cosmos DB offers single-digit millisecond response times, automatic and instant scalability, along with guaranteed speed at any scale.
• Microsoft Teams uses Cosmos DB for data storage.
• Further information on Cosmos DB can be found here.

User Impact

Users may have experienced delays in sending and receiving messages and were unable to create chats or channels.

Scope of Impact

This issue could have affected any user attempting to use the affected features from the Microsoft Teams desktop, web and mobile clients.

Incident Start Date and Time

Tuesday, January 10, 2023, at 8:30 AM UTC

Incident End Date and Time

Tuesday, January 10, 2023, at 11:45 AM UTC

Root Cause

• Our investigation identified that a backend database latency issue caused timeouts and delays within the service that sends messages in Teams.
• We’re continuing to investigate the underlying issue that caused latency within the database and more details will be provided in the full post-incident report.

Actions Taken (All times UTC)

Tuesday, January 10

• ・9:04 AM – We started receiving multiple signals from social media indicating an issue with Microsoft Teams messaging features.
• ・9:11 AM – We raised a high-priority investigation and started to analyze diagnostic data.
• ・9:42 AM – We identified anomalies within our backend database infrastructure.
• ・10:06 AM – Service logs showed that internal middleware services that enable the chat functionality within Microsoft Teams were having issues interacting with our backend database infrastructure (CosmosDB).
• ・10:19 AM – While we were investigating the cause of the issue, telemetry indicated that the service was showing signs of improvement.
• We continued to review infrastructure logs to isolate the source of the issue.
• ・11:02 AM – We started to review mitigation options to expedite service recovery.
• ・11:23 AM – Telemetry indicated that the impacted Microsoft Teams scenarios had recovered to approximately 97% availability.
• ・11:45 AM – Telemetry indicated that the service was performing within acceptable thresholds.
• We began a period of extended monitoring whilst we continued to investigate the cause of the issue.
• ・1:10 PM – After a period of extended monitoring, we declared the issue resolved.
• However, we continued our investigation to isolate the root cause of the issue.

Next Steps

January 10, 2023 10:18 PM

• ・Title : Delays in sending and receiving messages and unable to create chats or channels
• ・User Impact : Users may have experienced delays in sending and receiving messages and were unable to create chats or channels.
• ・Final status : We’ve monitored the service and received further confirmation from previously affected users that impact has been remediated.
• ・Scope of impact : This issue could have affected any user attempting to use the affected features from the Microsoft Teams desktop, web and mobile clients.
• ・Start time : Tuesday, January 10, 2023, 5:30 PM (8:30 AM UTC)
• ・End time : Tuesday, January 10, 2023, 8:45 PM (11:45 AM UTC)
• ・Preliminary Root cause : Our investigation identified that a backend database latency issue caused timeouts and delays within the service that sends messages in Teams.
• We’re continuing to investigate the underlying issue that caused latency within the database and more details will be provided in the full post-incident report.
• ・Next steps : – Identify the underlying issue that caused latency within the database.
• – Review monitoring telemetry to better detect these issues in future.
• We’ll publish a post-incident report within five business days.

January 10, 2023 9:13 PM

• ・Title : Users may be unable to send and receive messages in Microsoft Teams chats or channels
• ・User Impact : Users may be unable to send and receive messages in Microsoft Teams chats or channels.
• ・Current status : Telemetry and reports from previously affected users indicate that the service has recovered.
• We’re continuing to monitor the service and understand the underlying root cause of this issue.
• ・Scope of impact : This issue could affect any user attempting to send or receive messages.
• ・Start time : Tuesday, January 10, 2023, 6:00 PM (9:00 AM UTC)
• ・Root cause : A backend database issue was causing delays with sending and receiving messages.
• ・Next update by : Tuesday, January 10, 2023, 11:30 PM (2:30 PM UTC)

January 10, 2023 8:38 PM

• ・Title : Users may be unable to send and receive messages in Microsoft Teams chats or channels
• ・User Impact : Users may be unable to send and receive messages in Microsoft Teams chats or channels.
• ・Current status : Our investigation has identified a backend database issue that is causing delays with messages.
• We’re exploring several mitigation options including failing over to alternate infrastructure.
• We’re currently validating these mitigation options to ensure there is no residual impact after the implementation of these actions.
• ・Scope of impact : This issue could affect any user attempting to send or receive messages.
• ・Start time : Tuesday, January 10, 2023, 6:00 PM (9:00 AM UTC)
• ・Root cause : A backend database issue is causing delays with sending and receiving messages.
• ・Next update by : Tuesday, January 10, 2023, 10:30 PM (1:30 PM UTC)

January 10, 2023 7:17 PM

• ・Title : Users may be unable to send and receive messages in Microsoft Teams chats or channels
• ・User Impact : Users may be unable to send and receive messages in Microsoft Teams chats or channels.
• ・Current status : We’re reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan.
• ・Scope of impact : Impact is specific to users who are served through the affected infrastructure.
• ・Next update by : Tuesday, January 10, 2023, 9:30 PM (12:30 PM UTC)

January 10, 2023 6:46 PM

• ・Title : Users may be unable to send and receive messages in Microsoft Teams chats or channels
• ・User impact : Users may be unable to send and receive messages in Microsoft Teams chats or channels.
• ・Current status : We’re investigating a potential issue and checking for impact to your organization. We’ll provide an update within 30 minutes.

Microsoft Teams とは？

Microsoft Teams は、Microsoft の提供するコラボレーション ツールになります。

Microsoft 関連記事一覧

関連リンク

• ・Microsoft Teams｜リモート ワークのためのコラボレーション ツール：https://www.microsoft.com/ja-jp/microsoft-365/microsoft-teams/group-chat-software
• ・日本マイクロソフト – Official Home Page：https://www.microsoft.com/ja-jp

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