Microsoft 365 のサービス正常性（TM439228）にて、Microsoft Teams のライセンスを持たないゲスト ユーザーが、社内で開催される Microsoft Teams の会議内でチャットを利用できない場合があるアドバイザリが発生していました。

“TM439228” のサマリー

目次

Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings – TM439228

サービス：Microsoft Teams

状態：Service restored

ユーザーへの影響：Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.

Microsoft 365 のサービス正常性（TM439228）にて、Microsoft Teams のライセンスを持たないゲスト ユーザーが、社内で開催される Microsoft Teams 内の会議内でチャットを利用できない場合があるアドバイザリが発生していました。

この問題の影響を受けている場合、Microsoft Teams のライセンスを持たない外部ユーザーが、Microsoft Teams デスクトップ クライアントおよび Microsoft Teams ブラウザー版で、招待元テナント側で主催される Microsoft Teams の会議内のチャットを利用しようとした際に発生していた可能性があなります。

現在は、修正プログラムの展開が完了し、本事象の影響が改善したことを確認しています。

この問題は、ユーザーのライセンス チェックと連動するコードの変更によって、ライセンスを持たない外部ユーザーが、招待元テナントで開催されている Microsoft Teams の会議チャットにアクセスできないことによって発生している事象になります。

今後は、ゲスト ユーザーの権限に関する Microsoft Teams のアップデート手順を見直し、今後、同様の問題に対するインフラストラクチャーの強化を実施するとのことです。

この問題は、Microsoft Teams のライセンスを持たない外部ユーザーが、招待元テナント側で開催された Microsoft Teams の会議内でチャットを利用した際に影響を受ける可能性があります。

December 10, 2022 3:28 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may have been unable to use chats within internally hosted Teams meetings.
• ・More info : This impacted external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Final status : Deployment of the fix is complete, and we’ve confirmed through our internal telemetry that meeting chat has been restored for guest users and impact is remediated.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may have been impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・End time : Wednesday, December 7, 2022, 2:37 AM (12/6/2022, 5:37 PM UTC)
• ・Root cause : A code change that interacts with user license checks was preventing external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next steps : – We’re reviewing our Microsoft Teams feature update procedures pertaining to guest user permissions to reinforce our infrastructure against similar future issues.
• This is the final update for the event.

December 6, 2022 2:43 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : The fix deployment is continuing as expected and affected guest users will see relief as it progresses.
• We expect the deployment to complete by the next scheduled update.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Estimated time to resolve : We estimate the fix deployment will complete and remediate impact for all guest users by our next update.
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Saturday, December 10, 2022, 5:00 AM (12/9/2022, 8:00 PM UTC)

November 23, 2022 3:07 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We’re continuing to monitor the deployment as it progresses however it’s taking longer than initially expected.
• We now estimate the fix will complete the week of December 5, 2022.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Tuesday, December 6, 2022, 5:00 AM (12/5/2022, 8:00 PM UTC)

November 16, 2022 7:49 PM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : Our validation of the fix has completed and we’ve initiated the deployment to all impacted environments.
• Due to the nature of the fix, we expect the deployment to complete around the week of November 28, 2022.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, November 23, 2022, 6:00 AM (11/22/2022, 9:00 PM UTC)

October 26, 2022 4:38 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We’ve confirmed that the validation process is progressing as expected and anticipate its completion by our next update.
• Due to the nature of the fix, we expect the deployment to complete around the week of November 28, 2022.
• Once that is complete, we’ll begin our phased deployment process starting with the initial stage for additional testing, and we’ll provide a more specific date and time for when the fix should reach affected users once available.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, November 9, 2022, 4:30 AM (11/8/2022, 7:30 PM UTC)

October 12, 2022 4:15 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We’re continuing the validation process of our fix to ensure its efficacy and we’re in the initial stages of preparing it for a phased deployment to all affected environments.
• We anticipate being able to provide a more precise deployment estimate by our next scheduled update.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, October 26, 2022, 4:30 AM (10/25/2022, 7:30 PM UTC)

October 5, 2022 3:59 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : Due to the nature of the fix, we’re beginning a lengthy period of validation and testing that’s required to ensure no secondary impact will be introduced.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, October 12, 2022, 4:30 AM (10/11/2022, 7:30 PM UTC)

September 28, 2022 4:10 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We’ve confirmed we’ll proceed with developing a code fix for deployment to address this issue.
• We expect development of the fix to be complete by our next scheduled communication, after which the fix will undergo testing and validation before proceeding with deployment to the affected environment.
• Given the nature of the fix and the associated changes required to resolve the issue, we expect that the solution may take an extended period of time to be deployed.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, October 5, 2022, 4:30 AM (10/4/2022, 7:30 PM UTC)

September 27, 2022 8:02 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We’re continuing to assess remediation options pertaining to a potential code fix to address the issue caused by the code change responsible for impact to ensure a safe pathway to resolution.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Start time : Tuesday, June 8, 2021, 3:21 AM (6/7/2021, 6:21 PM UTC)
• ・Root cause : A code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by : Wednesday, September 28, 2022, 4:30 AM (9/27/2022, 7:30 PM UTC)

September 27, 2022 6:25 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : We found that a recent code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• We’re assessing various remediation options before pursuing a code fix.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Root cause : A recent code change that interacts with user license checks introduced an issue that prevents external users without a license from accessing internally hosted Microsoft Teams meeting chats.
• ・Next update by: Tuesday, September 27, 2022, 9:30 AM (12:30 AM UTC)

September 27, 2022 2:23 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・More info : This impacts external users without Microsoft Teams licenses that attempt to utilize the chat for internally hosted Microsoft Teams meetings within the Microsoft Teams desktop and web clients.
• ・Current status : Our investigation of the Microsoft Teams diagnostic logs has been inconclusive.
• We’re attempting to determine if any changes have occurred in the affected environment that have resulted in impact to the chat functionality for external users without Microsoft Teams licenses.
• Once this is determined, we can create a plan of action to remediate impact.
• ・Scope of impact : External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Next update by : Tuesday, September 27, 2022, 7:00 AM (9/26/2022, 10:00 PM UTC)

September 27, 2022 1:04 AM

• ・Title : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings
• ・User Impact : Guest users without Microsoft Teams licenses may be unable to use chats within internally hosted Teams meetings.
• ・Current status : We’re analyzing Microsoft Teams diagnostic logs to determine the source of the issue.
• ・Scope of impact: External users without Microsoft Teams licenses attempting to utilize the chat within internally hosted Microsoft Teams meetings may be impacted.
• ・Next update by : Tuesday, September 27, 2022, 2:30 AM (9/26/2022, 5:30 PM 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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