【トラブルシューティング】Microsoft Teams ブラウザー版にて、ユーザーが画像を添付するとサムネイルが拡大される問題が発生【TM291450】【復旧済み】

Microsoft が提供する Microsoft 365 のサービス正常性（TM291450）にて、ユーザーが Microsoft Teams ブラウザー版にて画像を添付するとサムネイルの一部しか表示されない問題が発生していることを発表しています。

この問題は、Microsoft Teams ブラウザー版で画像を添付した際に画像の特定部分が拡大されていることにより発生している可能性があります。

なお、該当の画像をクリックすると添付した画像は正しく表示されます。

上記の問題は、Microsoft Teams ブラウザー版にて画像を添付する代わりに、コピー & ペーストで添付することで回避することができます。

※ Microsoft Teams デスクトップ クライアントを利用している場合も本事象の回避が可能です。

現在は、修正プログラムの展開が完了し、一部のユーザーでの影響が解消していることを確認しているとのことです。

今後は同様の影響を防ぐためにアップデートの開発中に問題が確認できなかったかを特定するためのテストおよび検証手順を見直すとのことです。

この問題は、Microsoft Teams クライアント アプリの画像プレビュー機能のアップデートにより、添付ファイルのサムネイルの互換性およびレンダリングに関する問題が発生したことによる影響になります。

※ この問題は組織単位で影響を受けており、画像を添付しようとしたテナント内のすべてのユーザーが影響を受けていた可能性があります。

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Users’ image thumbnails are too large when attached in the Microsoft Teams web client – TM291450

サービス：Microsoft Teams

状態：Service restored

ユーザーへの影響：Image thumbnails are zoomed in too much when attached in the Microsoft Teams web client.

Microsoft 365 のサービス正常性（TM291450）にて、ユーザーが Microsoft Teams ブラウザー版にて画像を添付するとサムネイルの一部しか表示されない問題が発生していることを発表しています。

この問題は、Microsoft Teams ブラウザー版で画像を添付した際に画像の特定部分が拡大されていることにより発生している可能性があります。

なお、該当の画像をクリックすると添付した画像は正しく表示されます。

上記の問題は、Microsoft Teams ブラウザー版にて画像を添付する代わりに、コピー & ペーストで添付することで回避することができます。

※ Microsoft Teams デスクトップ クライアントを利用している場合も本事象の回避が可能です。

現在は、修正プログラムの展開が完了し、一部のユーザーでの影響が解消していることを確認しているとのことです。

今後は同様の影響を防ぐためにアップデートの開発中に問題が確認できなかったかを特定するためのテストおよび検証手順を見直すとのことです。

この問題は、Microsoft Teams クライアント アプリの画像プレビュー機能のアップデートにより、添付ファイルのサムネイルの互換性およびレンダリングに関する問題が発生したことによる影響になります。

※ この問題は組織単位で影響を受けており、画像を添付しようとしたテナント内のすべてのユーザーが影響を受けていた可能性があります。

November 10, 2021 7:42 AM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users could only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images were likely zoomed into a specific part of the image.
• Clicking the image showed the image correctly.
• To bypass the impact in the Microsoft Teams web client, users could have copied and pasted the image instead of attaching it.
• Alternatively, users could have viewed the attachment thumbnail in the Microsoft Teams desktop client.
• ・Final status : We’ve completed our deployment of the chat code fix and confirmed with a subset of users that impact is resolved.
• ・Scope of impact : Your organization was affected by this event, and any user attempting to attach images may have been impacted.
• ・Start time : Monday, September 27, 2021, 7:46 PM (10:46 AM UTC)
• ・End time : Wednesday, November 10, 2021, 3:16 AM (11/9/2021, 6:16 PM UTC)
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails, resulting in impact.
• ・Next steps : – We’re reviewing our testing and validation procedures to identify how the issue was missed during development of the affecting update to better prevent similar future impact.
• This is the final update for the event.

November 9, 2021 4:04 AM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images are likely zoomed into a specific part of the image.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : The chat code fix has progressed to 50 percent and we still expect it to be complete by our next update time.
• We’ll continue to monitor progress and will confirm then.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Estimated time to resolve : We expect that our code fix will be fully deployed by Wednesday, November 10, 2021, 9:30 AM (12:30 AM UTC)
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by : Wednesday, November 10, 2021, 9:30 AM (12:30 AM UTC)

November 8, 2021 6:48 PM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images are likely zoomed into a specific part of the image.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : Deployment of the fix is taking longer than expected to complete.
• We’re monitoring its status as it progresses through the affected environment.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by : Tuesday, November 9, 2021, 4:30 AM (11/8/2021, 7:30 PM UTC)

November 2, 2021 5:54 PM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images are likely zoomed into a specific part of the image.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’ve developed a fix that will remediate impact on both standard images and GIF’s.
• We’re deploying the fix to the affected environment, which we anticipate will complete by Monday, November 8, 2021.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by : Monday, November 8, 2021, 7:30 PM (10:30 AM UTC)

October 26, 2021 3:58 AM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images are likely zoomed into a specific part of the image.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : During our fix validation process, we determined that it remediates impact to standard images, but GIFs remain affected.
• We’re continuing to validate and test the first fix while developing a separate solution to remediate impact to GIFs.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by: Tuesday, November 2, 2021, 4:00 PM (7:00 AM UTC)

October 21, 2021 2:35 AM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info: The thumbnail images are likely zoomed into a specific part of the image. Clicking the image shows the image correctly.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’ve determined that the feature setting enablement will require a code change deployment to remediate impact.
• We’re developing a code fix to remeidate impact and expect that testing should be complete by our next scheduled update.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by : Tuesday, October 26, 2021, 4:00 AM (10/25/2021, 7:00 PM UTC)

October 15, 2021 3:21 AM – Service restored

• ・Title : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client
• ・User Impact : Users can only see a portion of image thumbnails when attached in the Microsoft Teams web client.
• ・More info : The thumbnail images are likely zoomed into a specific part of the image.
• Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’ve confirmed that a recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• We’ve developed a fix for this issue in the form of enabling additional feature settings.
• While we expect that this feature setting enable action will need to progress through our safe deployment management process; we’re investigating methods for expediting the process without causing additional impact.
• ・Scope of impact : Your organization is affected by this event, and any user attempting to attach images may be impacted.
• ・Root cause : A recent update to an image preview feature for the Microsoft Teams desktop client created a compatibility and rendering issue for attached thumbnails is responsible for the impact.
• ・Next update by : Thursday, October 21, 2021, 4:00 AM (10/20/2021, 7:00 PM UTC)

October 14, 2021 1:45 PM – Service restored

• ・Title : Users’ image thumbnails are too large when attached in the Microsoft Teams web client
• ・User Impact : Image thumbnails are zoomed in too much when attached in the Microsoft Teams web client.
• ・More info : Clicking the image shows the image correctly.
• To bypass the impact in the Microsoft Teams web client, users can copy/paste the image instead of attaching it.
• Alternatively, users can view the attachment thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’re analyzing network trace logs and reproducing the impact to isolate the problem.
• ・Scope of impact : Your organization is affected by this event, and any users attempting to attach images are impacted.
• ・Next update by : Thursday, October 14, 2021, 4:30 PM (7:30 AM UTC)

October 14, 2021 12:22 PM – Service restored

• ・Title : Users’ image thumbnails are too large when attached in the Microsoft Teams web client
• ・User Impact: Image thumbnails are too large when attached in the Microsoft Teams web client.
• ・More info : Clicking the image shows the image correctly.
• To bypass the thumbnail impact, users can view the thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’re analyzing impact information provided by some affected users to determine the source of the issue.
• ・Scope of impact : Your organization is affected by this event, and any users attempting to attach images are impacted.
• ・Next update by : Thursday, October 14, 2021, 2:30 PM (5:30 AM UTC)

October 14, 2021 12:02 PM – Service restored

• ・Title : Users’ image thumbnails are too large when attached in the Microsoft Teams web client
• ・User Impact : Image thumbnails are too large when attached in the Microsoft Teams web client.
• ・More info : Clicking the image shows the image correctly.
• To bypass the thumbnail impact, users can view the thumbnail in the Microsoft Teams desktop client.
• ・Current status : We’re investigating a potential issue and checking for impact to your organization.
• We’ll provide an update within 30 minutes.
• ・Scope of impact : Your organization is affected by this event, and any users attempting to attach images are impacted.

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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