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Microsoft 365 のサービス正常性（TM485572）にて、一部のユーザーで Microsoft Teams の会議中に断続的に黒い画面が表示されるサービス アドバイザリが発生しています。

“TM485572” のサマリー

目次

Some users may intermittently see a black screen during Microsoft Teams meetings that include video – TM485572

サービス：Microsoft Teams

状態：Service restored

ユーザーへの影響：Some users may be unable to access OneNote in any Microsoft Teams channel.

Microsoft 365 のサービス正常性（TM485572）にて、一部のユーザーで Microsoft Teams の会議中に断続的に黒い画面が表示されるサービス アドバイザリが発生していました。

現在は、修正プログラムの展開が完了し、モニタリングの結果、本事象が改善したことを確認しました。

この問題は、Microsoft Teams の会議のビデオ ストリームのレンダリングを改善するための変更によって、ビデオ ストリームのレンダリング時に計算ミスにより発生した事象になります。

今後は、Microsoft Teams の会議のビデオ ストリームを見直し、今後同様の影響が発生しないようにするとのことです。

この問題は、Microsoft Teams 上で会議またはグループ通話中を行う一部ユーザーにて発生していた可能性があります。

February 2, 2023 5:56 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video
• ・User impact : Users intermittently saw a black screen during Microsoft Teams meetings or group calls that included video.
• ・Final status : We’ve confirmed with our internal monitoring system that the deployment has completed in full and the issue is remediated.
• ・Scope of impact : Some users may have been affected by this and may have seen a black screen during Microsoft Teams meetings or group calls.
• ・Start time : Thursday, November 10, 2022, 10:01 AM (1:01 AM UTC)
• ・End time : Tuesday, January 31, 2023, 6:46 AM (1/30/2023, 9:46 PM UTC)
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings was introducing the logic error that resulted in the miscalculation when rendering video streams.
• ・Next steps : – We’re reviewing our video stream rendering for Microsoft Teams meetings to prevent similar impact like this one from happening in the future.
• This is the final update for the event.

February 2, 2023 5:13 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video
• ・User impact : Users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings or group calls.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’ve verified that the fix has reached 100 percent saturation and are performing final validations to confirm that the issue is fully resolved.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings or group calls.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Thursday, February 2, 2023, 7:00 AM (2/1/2023, 10:00 PM UTC)

January 31, 2023 4:37 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video
• ・User impact : Users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings or group calls.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’ve determined that the fix deployment to address the additional impact affecting Microsoft Teams group calls that include video is 90 percent deployed to the impacted environment.
• We’ll continue monitoring the fix as it progresses to ensure it completes as expected to fully resolve this issue.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings or group calls.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Thursday, February 2, 2023, 5:00 AM (2/1/2023, 8:00 PM UTC)

January 24, 2023 3:56 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings or group calls.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’ve initiated the deployment of our fix to address the additional impact affecting Microsoft Teams group calls that include video, resulting in users seeing a black screen during affected meetings.
• We still anticipate that this deployment should complete by the end of January, 2023, and expect we’ll have a more accurate estimation for full impact resolution by our next update.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings or group calls.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Tuesday, January 31, 2023, 5:00 AM (1/30/2023, 8:00 PM UTC)

January 11, 2023 5:12 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings or group calls that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings or group calls.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status: We’ve applied a fix to address the impact to Microsoft Teams meetings and users should experience relief.
• Additionally, we’ve identified possible impact during Microsoft Teams group calls that include video, and we’re validating and developing a fix that has a projected deployment timeline for end of January 2023.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings or group calls.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Tuesday, January 24, 2023, 5:00 AM (1/23/2023, 8:00 PM UTC)

January 4, 2023 2:44 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings. The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : The internal validations for our developed fix have required more time than originally estimated.
• We’re continuing to internally validate our solution to ensure that its deployment will successfully remediate impact.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Wednesday, January 11, 2023, 5:00 AM (1/10/2023, 8:00 PM UTC)

December 19, 2022 7:59 PM – Service restored

• ・Title: Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact: Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info: The issue only affects one user at a time during Microsoft Teams meetings. The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status: Our preparations for the fix are taking longer than anticipated but are ongoing.
• We’ll provide an estimated completion time when one becomes available.
• ・Scope of impact: Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause: A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by: Monday, December 19, 2022, 8:00 PM (11:00 AM UTC)

December 17, 2022 1:03 PM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : Our preparations for the fix are taking longer than anticipated but are ongoing.
• We’ll provide an estimated completion time when one becomes available.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Monday, December 19, 2022, 8:00 PM (11:00 AM UTC)

December 17, 2022 7:04 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings. The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’re continuing our efforts of preparing the fix for deployment and anticipate being able to provide an approximate deployment timeline by our next communications update.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Saturday, December 17, 2022, 1:00 PM (4:00 AM UTC)

December 16, 2022 7:39 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’ve completed the internal testing and validations for our fix and are preparing it for deployment.
• We’re expecting that an estimate for our fix deployment timeline and the remediation of impact will be available by our next scheduled update.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Saturday, December 17, 2022, 7:30 AM (12/16/2022, 10:30 PM UTC)

December 15, 2022 11:52 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’re continuing to develop a fix for the issue and anticipate we will have begun the testing process by our next scheduled update.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Friday, December 16, 2022, 9:00 AM (12:00 AM UTC)

December 15, 2022 10:44 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’ve confirmed that a change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• We’re developing a fix to address the miscalculation issue, which will require testing and validation prior to deployment.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Root cause : A change intended to improve video stream rendering for Microsoft Teams meetings introduced the logic error resulting in the miscalculation when rendering video streams.
• ・Next update by : Thursday, December 15, 2022, 1:00 PM (4:00 AM UTC)

December 15, 2022 10:09 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue only affects one user at a time during Microsoft Teams meetings.
• The affected user can restore their video by turning their camera off and then back on again; however, another user then becomes affected.
• This issue appears on Microsoft Teams Meeting Room devices and the Windows and Mac desktop clients.
• ・Current status : We’re continuing our analysis of logging information to determine the best remediation strategies.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Next update by : Thursday, December 15, 2022, 12:00 PM (3:00 AM UTC)

December 15, 2022 8:33 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue affects a single user during Microsoft Teams video meetings.
• However, if that user turns their camera on and off, they are able to see the video being presented, but another user becomes affected.
• ・Current status : We’ve identified that a potential logic error is causing a miscalculation in the number of video streams rendered during meetings, resulting in impact.
• We’re investigating the underlying source of this logic error to better understand how it manifests and formulate potential remediation strategies.
• ・Scope of impact : Some users may be affected by this and may see a black screen during Microsoft Teams meetings.
• ・Next update by : Thursday, December 15, 2022, 10:00 AM (1:00 AM UTC)

December 15, 2022 8:19 AM – Service restored

• ・Title : Some users may intermittently see a black screen during Microsoft Teams meetings that include video
• ・User Impact : Users may intermittently see a black screen during Microsoft Teams meetings that include video.
• ・More info : The issue affects a single user during Microsoft Teams video meetings.
• However, if that user turns their camera on and off, they are able to see the video being presented, but another user becomes affected.
• ・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。

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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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