Microsoft 365 のサービス正常性（TM468497）にて、ごく一部の Android ユーザーで、着信時に Microsoft Teams モバイル アプリケーションがクラッシュする場合のあるアドバイザリが発生していました。

“TM468497” のサマリー

目次

A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls – TM468497

サービス：Microsoft Teams

状態：Service restored

ユーザーへの影響：A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.

Microsoft 365 のサービス正常性（TM468497）にて、ごく一部の Android ユーザーで、着信時に Microsoft Teams モバイル アプリケーションがクラッシュする場合のあるアドバイザリが発生していました。

本事象の影響を受けているユーザーは、Microsoft Teams モバイル アプリケーションで着信があったことに気づかない可能性があります。

また、その着信がトリガーとなり、ユーザーが通話を受ける前にアプリケーションがクラッシュする可能性があります。

この問題は、最新のビルド “1416/1.0.0.2022413901” にアップデートしたユーザーに発生する特有の問題となるため、Microsoft Teams デスクトップ クライアント版および Microsoft Teams ブラウザー版を利用することで回避できます。

現在は、修正プログラムの有効性を確認したため、影響を受けた環境全体への展開へと拡大しました。

その後、修正プログラムの展開が完了し、一定期間のサービスのモニタリングの結果、影響の改善を確認しています。

今後は、本事象の要因となった更新プログラムを検証し、コードの問題が発生した要因を分析することで、ユーザーへの影響が発生する前に同様の問題が、より適切に特定できるように取り組んでいきます。

これは、最新のビルド（”1416/1.0.0.2022413901″）のコーディングに問題があったことにより、Microsoft Teams モバイル アプリケーションの通話 API が一部の着信時にクラッシュすることがある問題になります。

この問題は、最新のビルド “1416/1.0.0.2022413901” にアップデートした Android ユーザーのサブセットに影響する可能性があります。

November 29, 2022 3:26 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : Android users may have experienced Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not have been aware that they were getting an incoming call in the app.
• Instead, a call was triggered, and the app may have crashed prior to users getting the call.
• Impact was specific to users that had upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users were able to utilize the Microsoft Teams desktop and web app, if available to them, without issue.
• ・Final status : After confirming the viability of our fix, we’ve broadly expanded our deployment to the entire affected environment.
• After the fix had been fully deployed and a period of monitoring our service telemetry, we’ve internally validated that impact has been remediated.
• ・Scope of impact : The problem may have impacted a subset of Android users that had upgraded to the new 1416/1.0.0.2022413901 build.
• ・Start time : Wednesday, November 16, 2022, 2:00 AM (11/15/2022, 5:00 PM UTC)
• ・End time : Saturday, November 26, 2022, 12:00 PM (3:00 AM UTC)
• ・Root cause : A recent Android API 31 update to the Microsoft Teams mobile app contained a code issue that resulted in impact.
• ・Next steps : – We’re further reviewing the offending update to better understand why it produced the code issue to help better identify similar problems before impact to users is introduced.
• This is the final update for this event.

November 24, 2022 4:18 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : Our review of service telemetry confirms that the fix is effectively resolving impact for users within the five percent targeted rollout environment, and we’re initiating deployment to another five percent of the total impacted service environment.
• While we’re still unable to provide a precise estimated time to completion, we’ll delineate more information regarding the fix’s progress at our next scheduled update.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Start time : Wednesday, November 16, 2022, 2:00 AM (11/15/2022, 5:00 PM UTC)
• ・Root cause : A coding issue in the problematic build is causing the Microsoft Teams mobile application calling API to crash when receiving some incoming calls.
• ・Next update by : Tuesday, November 29, 2022, 4:30 AM (11/28/2022, 7:30 PM UTC)

November 22, 2022 3:29 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : Validation of the fix is complete and we’re monitoring the affected environment to asses the current crash rates and reviewing our options for deployment.
• We anticipate that an incremental deployment of the fix will begin shortly, and that we’ll have an approximate timeline for it’s completion by our next update.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Start time : Wednesday, November 16, 2022, 2:00 AM (11/15/2022, 5:00 PM UTC)
• ・Root cause : A coding issue in the problematic build is causing the Microsoft Teams mobile application calling API to crash when receiving some incoming calls.
• ・Next update by : Wednesday, November 23, 2022, 4:30 AM (11/22/2022, 7:30 PM UTC)

November 20, 2022 3:50 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : We’ve developed a configuration code change as a potential solution for this issue and we’re validating this fix to ensure it will successfully remediate the problem before applying it to the affected environments.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Start time : Wednesday, November 16, 2022, 2:00 AM (11/15/2022, 5:00 PM UTC)
• ・Root cause : A coding issue in the problematic build is causing the Microsoft Teams mobile application calling API to crash when receiving some incoming calls.
• ・Next update by: Tuesday, November 22, 2022, 4:30 AM (11/21/2022, 7:30 PM UTC)

November 19, 2022 10:26 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : We’ve identified a coding issue in the problematic build which is causing the Microsoft Teams mobile application calling API to crash when receiving some incoming calls.
• We’re developing a configuration code change to remediate impact.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Start time : Wednesday, November 16, 2022, 2:00 AM (11/15/2022, 5:00 PM UTC)
• ・Root cause : A coding issue in the problematic build is causing the Microsoft Teams mobile application calling API to crash when receiving some incoming calls.
• ・Next update by : Sunday, November 20, 2022, 4:30 AM (11/19/2022, 7:30 PM UTC)

November 19, 2022 9:48 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : We’re reviewing a portion of code in the problematic build related to an API involved in the facilitation of calls through the mobile app to gain an understanding of the underlying root cause and to determine if a code change may need to be implemented to restore service.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Next update by : Saturday, November 19, 2022, 12:00 PM (3:00 AM UTC)

November 19, 2022 9:02 AM – Service restored

• ・Title : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls
• ・User Impact : A small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• ・More info : Users may not be aware that they’re getting an incoming call in the app.
• Instead, a call is triggered, and the app may crash prior to users getting the call. Impact is specific to users that have upgraded to the new 1416/1.0.0.2022413901 build.
• Affected users can utilize the Microsoft Teams desktop and web app without issue.
• ・Current status : Our internal monitoring system alerted us to an issue in which a small subset of Android users may experience Microsoft Teams mobile app crashes when receiving incoming calls.
• We’re viewing internal telemetry to isolate the source of the impact and identify a remediation plan.
• ・Scope of impact : The problem may impact a subset of Android users that have upgraded to the new 1416/1.0.0.2022413901 build.
• ・Next update by : Saturday, November 19, 2022, 10:00 AM (1:00 AM UTC)

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。

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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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