【トラブルシューティング】SharePoint Online のサイトの UI（ユーザーインタフェース）からサブサイトの作成が行えない問題が発生【SP296199】【復旧済み】

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Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online

Microsoft が提供する Microsoft 365 のサービス正常性（SP296199）にて、SharePoint Online のサイトの UI（ユーザーインタフェース）から管理者がクラシック UI のサブサイトが行えない問題が発生していることを発表しています。

現在は、修正プログラムの展開後、影響が改善していることを確認しているとのことです。

この問題は、SharePoint Online のサービス最適化を行うためのアップデートにより、管理者ユーザーが SharePoint Online 内の UI 経由でクラシック UI のサブサイトを作成することが誤って妨げられることにより発生した問題とのことです。

今後は、アップデート手順を見直し、影響が発生した原因を調査し、開発及びテスト中に同様の問題が発生した際に特定できるようにするとのことです。

※ この問題は、サブサイトの作成権限を持つすべての管理者が、SharePoint Online のサイトの UI（ユーザーインタフェース）からクラシック UI のサブサイトを作成しようとした際に影響を受ける可能性がある問題になります。

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サービス：SharePoint Online

状態：Service degradation

ユーザーへの影響：Admins can’t create classic subsites through the site collection UI within SharePoint Online.

Microsoft 365 のサービス正常性（SP296199）にて、SharePoint Online のサイトの UI（ユーザーインタフェース）から管理者がクラシック UI のサブサイトが行えない問題が発生していることを発表しています。

現在は、修正プログラムの展開後、影響が改善していることを確認しているとのことです。

・Title : Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online
・User Impact : Admins couldn’t create classic subsites through the site collection UI within SharePoint Online.
・Final status : Following our fix deployment, we’ve internally validated that impact has been remediated.
・Scope of impact : All admins with subsite creation permissions that attempted to create classic subsites from the site collection UI within SharePoint Online may have experienced impact.
・Start time : Friday, October 22, 2021, 4:01 PM (7:01 AM UTC)
・End time : Tuesday, November 9, 2021, 4:39 AM (11/8/2021, 7:39 PM UTC)
・Root cause : An update for optimizing the service was inadvertently preventing admins from creating classic subsites through the site collection UI within SharePoint Online.
・Next steps : – We’re reviewing our update procedures to better understand why it produced impact, and to help identify similar issues during our development and testing cycles.
This is the final update for the event.

・Title : Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online
・User Impact : Admins can’t create classic subsites through the site collection UI within SharePoint Online.
・Current status: Our fix to resolve the issue is saturated across 43 percent of the affected environment.
We’ll continue to monitor its progress to ensure it doesn’t encounter any delays and will aim to provide an estimated time to completion as it becomes feasible.
・Scope of impact : All admins with subsite creation permissions that attempt to create classic subsites from the site collection UI within SharePoint Online may experience impact.
・Start time : Friday, October 22, 2021, 4:01 PM (7:01 AM UTC)
・Root cause : An update for optimizing the service is inadvertently preventing admins from creating classic subsites through the site collection UI within SharePoint Online.
・Next update by : Tuesday, November 9, 2021, 6:30 AM (11/8/2021, 9:30 PM UTC)

・Title : Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online
・User Impact : Admins can’t create classic subsites through the site collection UI within SharePoint Online.
・Current status : Our fix to resolve the issue has initiated deployment, and has currently saturated throughout seven percent of the affected environment.
We’re continuing to monitor its progress while we establish an estimated timeline to completion.
・Scope of impact : All admins with subsite creation permissions that attempt to create classic subsites from the site collection UI within SharePoint Online may experience impact.
・Start time : Friday, October 22, 2021, 4:01 PM (7:01 AM UTC)
・Root cause : An update for optimizing the service is inadvertently preventing admins from creating classic subsites through the site collection UI within SharePoint Online.
・Next update by : Saturday, November 6, 2021, 5:30 AM (11/5/2021, 8:30 PM UTC)

・Title : Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online
・User Impact : Admins can’t create classic subsites through the site collection UI within SharePoint Online.
・Current status : We’ve determined that an update for optimizing the service is inadvertently preventing admins from creating classic subsites through the site collection UI within SharePoint Online.
We’re deploying a fix to remediate the impact.
・Scope of impact : All admins with subsite creation permissions that attempt to create classic subsites from the site collection UI within SharePoint Online may experience impact.
・Start time : Friday, October 22, 2021, 4:01 PM (7:01 AM UTC)
・Root cause : An update for optimizing the service is inadvertently preventing admins from creating classic subsites through the site collection UI within SharePoint Online.
・Next update by : Friday, November 5, 2021, 6:00 AM (11/4/2021, 9:00 PM UTC)

・Title : Admins can’t create classic subsites through the site collection user interface (UI) within SharePoint Online
・User Impact : Admins can’t create classic subsites through the site collection UI within SharePoint Online.
・Current status : We’re analyzing Unified Logging Service (ULS) logs to determine the source of the issue.
・Scope of impact : All admins with subsite creation permissions that attempt to create classic subsites from the site collection UI within SharePoint Online may experience impact.
・Next update by : Thursday, November 4, 2021, 9:30 AM (12:30 AM UTC)