Microsoft が提供する Microsoft 365 のサービス正常性（EX394836）にて、一部のユーザーが Exchange Online のパブリック フォルダー内にサブ フォルダーの作成が行えない SI（サービス インシデント）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では、以下のエラー メッセージが表示されます。

“フォルダーを作成できません。”

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

この問題は、最近のパブリック フォルダーの操作のサブセットに対する昇格要求の処理方法の変更の結果、パブリック フォルダー内のサブ フォルダー作成要求の認証に失敗することがある事象になります。

本事象はテスト環境での検証および修正を行った上で、本番環境での有効化を行っていましたが、さらなる検証や修正佐票が必要となるアップデートでした。

さらに、すべてのインフラストラクチャーが、この変更の影響を受けるわけではないことも確認しており、影響の緩和を迅速化し、混乱を防ぐために、最近のアップデートをロールバックしています。

しかしながら、初期段階に影響の範囲が確認できていたため、ロールバックまでの時間も要し、影響が長期化する結果となりました。

次回のアップデートにて、Post Incident Repot（PIR）を発行予定です。

目次

Some users can’t create subfolders within public folders through any Exchange Online connection method – EX394836

サービス：Exchange Online

状態：Service restored

ユーザーへの影響：Users can’t create subfolders within public folders through any Exchange Online connection method.

Microsoft 365 のサービス正常性（EX394836）にて、一部のユーザーが Exchange Online のパブリック フォルダー内にサブ フォルダーの作成が行えない SI（サービス インシデント）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では、以下のエラー メッセージが表示されます。

“フォルダーを作成できません。”

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

この問題は、最近のパブリック フォルダーの操作のサブセットに対する昇格要求の処理方法の変更の結果、パブリック フォルダー内のサブ フォルダー作成要求の認証に失敗することがある事象になります。

本事象はテスト環境での検証および修正を行った上で、本番環境での有効化を行っていましたが、さらなる検証や修正佐票が必要となるアップデートでした。

さらに、すべてのインフラストラクチャーが、この変更の影響を受けるわけではないことも確認しており、影響の緩和を迅速化し、混乱を防ぐために、最近のアップデートをロールバックしています。

しかしながら、初期段階に影響の範囲が確認できていたため、ロールバックまでの時間も要し、影響が長期化する結果となりました。

次回のアップデートにて、Post Incident Repot（PIR）を発行予定です。

Post Incident Repot（PIR）

Incident Information

User Impact

Users may have been unable to create subfolders within public folders through any Exchange Online connection method.

Affected users saw the following error message : “Cannot create the folder.”

Scope of Impact

This issue impacted some users attempting to create new subfolders within public folders through all Exchange Online connection methods.

Incident Start Date and Time

Wednesday, June 8, 2022, at 6:00 PM UTC

Incident End Date and Time

Friday, July 15, 2022, at 5:30 PM UTC

Root Cause

A recent change in how elevation requests are handled for a subset of public folder actions resulted in authorization failures for subfolder creation requests in public folders.

This issue was originally identified and corrected within our testing environments but would have required further validation and a potential refresh activity to take effect.

Furthermore, it was identified that not all infrastructure would have been affected by this change and in the interest of expediting mitigation and preventing disruption, we elected to rollback the initial change.

However, our initial understanding of the scope of impact resulted in the rollback taking an extended period of time, and prolonging impact.

Actions Taken (All times UTC)

Tuesday, June 21, 2022

A recent change in how permission checks were handled for some public folder actions completed and this is our earliest estimate for when impact could have begun.

Thursday, June 23, 2022

• ・11:14 PM – We began receiving multiple reports of users being unable to create new subfolders within public folders.
• ・11: 18 PM – We posted a notification to the Service Health Dashboard (SHD) under EX394836
• ・11:24 PM – We determined that users affected by this issue would have seen the following error message : “Cannot create folder”.
• ・11:30 PM – We began reviewing diagnostic data and attempted to reproduce the issue on our internal test infrastructure.

Friday, June 24, 2022

• ・2:37 AM – We began requesting Fiddler traces from customers that reported impact.
• ・2:49 AM – We determined that impact was transient in nature and did not impact all users, but a subset within a tenant.
• ・6:59 PM – We identified a recent change that may be the source of the issue and began reviewing rollback options.
• ・7:00 PM – We expanded the scope of the communication to all production tenants as we identified this issue affected a larger scope than originally understood.
• ・7:18 PM – We investigated to determine if we deployed a fix if a refresh/restart of a user’s session would be required to pick it up.
• ・7:28 PM – In an effort to prevent further disruption, we decided to roll back the change to address the issue, and we began the validation process.

Saturday, June 25, 2022

• ・4:28 PM – We completed the validation process and initiated deployment with an expectation that it would be completed in approximately four to five days.
• ・4:53 PM – We received an update that deployment had reached 40 percent saturation in the affected environment.
• Furthermore, users would have begun to experience relief as the fix reached their environment.

Thursday, June 30, 2022

• ・7:25 PM – We determined the rollback may take longer to complete than initially estimated.
• At this time, the deployment had reached approximately 65 percent saturation.

Friday, July 1, 2022

• ・6:58 PM – The fix reached 83 percent saturation.

Tuesday July 5, 2022

• ・6:50 PM – The deployment reaches 90 percent saturation.
• At this time, the issue was resolved for the majority of impacted users; however, we continued to monitor the status of the deployment until we could confirm this issue was resolved for all affected users.

Friday, July 15, 2022

• ・6:51 PM – The rollback completed, and we confirmed through our telemetry that impact was remediated as of July 15, 2022, at 5:30 PM UTC.

Next Steps

July 28, 2022 6:40 PM – Service restored

A post-incident report has been published.

July 23, 2022 7:39 AM – Service restored

A post-incident report has been published.

July 20, 2022 7:37 PM – Service restored

A post-incident report has been published.

July 16, 2022 3:51 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users may have been unable to create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users saw the following error message : “Cannot create the folder.”
• ・Final status : Deployment of the fix is complete and we’ve confirmed through our telemetry that impact is remediated.
• ・Scope of impact : This issue impacted some users attempting to create new subfolders within public folders through all Exchange Online connection methods.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・End time : Saturday, July 16, 2022, 2:30 AM (7/15/2022, 5:30 PM UTC)
• ・Root Cause : A recent change in how elevation requests are handled for a subset of public folder actions resulted in authorization failures for subfolder creation requests in public folders.
• This issue was originally identified and corrected within our testing environments but would have required further validation and a potential refresh activity to take effect.
• Furthermore, it was identified that not all infrastructure would have been affected by this change and in the interest of expediting mitigation and preventing disruption, we elected to rollback the initial change.
• However, our initial understanding of the scope of impact resulted in the rollback taking an extended period of time, and prolonging impact.
• ・Next steps : – For a more comprehensive list of next steps and actions, please refer to the Post Incident Review document.

July 9, 2022 3:24 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : According to monitoring telemetry and confirmation from some formerly affected users, the majority of those previously impacted should now be able to create subfolders within public folders without issue.
• Other users, however, may experience continued impact as the fix saturates throughout all affected environments.
• While we’re unable to definitively pinpoint its estimated completion, we’re monitoring the deployment process and will provide more information regarding its progress via our next scheduled update.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・Preliminary root cause : A recent change in how permission checks are handled for some public folder actions is resulting in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Saturday, July 16, 2022, 4:30 AM (7/15/2022, 7:30 PM UTC)

July 6, 2022 3:50 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : The fix has reached 90 percent saturation; however, it continues to progress slower than anticipated.
• Additional users will continue to see relief as the deployment progresses.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・Preliminary root cause : A recent change in how permission checks are handled for some public folder actions is resulting in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Saturday, July 9, 2022, 4:30 AM (7/8/2022, 7:30 PM UTC)

July 2, 2022 3:57 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : The fix deployment has reached over 83 percent saturation.
• We expect complete remediation by the next scheduled update.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・Preliminary root cause : A recent change in how permission checks are handled for some public folder actions is resulting in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Wednesday, July 6, 2022, 5:00 AM (7/5/2022, 8:00 PM UTC)

July 1, 2022 4:22 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : The fix deployment is taking longer than expected but has reached over 65 percent saturation.
• We expect complete remediation by the next scheduled update.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・Preliminary root cause : A recent change in how permission checks are handled for some public folder actions is resulting in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Saturday, July 2, 2022, 4:00 AM (7/1/2022, 7:00 PM UTC)

June 26, 2022 1:53 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : We’ve completed validation and initiated the fix deployment, which has saturated across approximately 40 percent of the affected service environment.
• We estimate impact will be remediated by the end of Thursday, June 30, 2022.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Thursday, June 9, 2022, 3:00 AM (6/8/2022, 6:00 PM UTC)
• ・Estimated time to resolve : We estimate impact will be remediated by the end of Thursday, June 30, 2022.
• ・Root cause : A recent change in how permission checks are handled for some public folder actions resulted in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Friday, July 1, 2022, 5:00 AM (7/30/2022, 8:00 PM UTC)

June 25, 2022 10:19 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : We’re continuing to validate the fix to ensure the efficacy prior to deployment.
• We anticipate deployment of the fix to begin by our next update time.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Wednesday, June 22, 2022, 4:09 PM (7:09 AM UTC)
• ・Estimated time to resolve : We estimate impact will be remediated by the end of Thursday, June 30, 2022.
• ・Root cause : A recent change in how permission checks are handled for some public folder actions resulted in authorization failures for subfolder creation requests in public folders.
• ・Next update by : Sunday, June 26, 2022, 3:30 AM (6/25/2022, 6:30 PM UTC)

June 25, 2022 5:32 AM – Service restored

• ・Title : Some users can’t create subfolders within public folders through any Exchange Online connection method
• ・User Impact : Users can’t create subfolders within public folders through any Exchange Online connection method.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : We’ve identified that a recent change in how permission checks are handled for some public folder actions resulted in authorization failures for subfolder creation request in public folders.
• We’ve developed a fix to disable the permission check and are validating to ensure the efficacy of our fix prior to deployment.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Start time : Wednesday, June 22, 2022, 4:09 PM (7:09 AM UTC)
• ・Root cause : A recent change in how permission checks are handled for some public folder actions resulted in authorization failures for subfolder creation request in public folders.
• ・Next update by : Saturday, June 25, 2022, 12:00 PM (3:00 AM UTC)

June 24, 2022 12:02 PM – Service restored

• ・Title : Some users can’t create new subfolders within public folders in any Outlook app
• ・User Impact : Users are unable to create new subfolders within public folders in any Outlook app.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : Our investigation thus far has been inconclusive and our efforts to reproduce the issue have been unsuccessful.
• We’re reviewing Problem Steps Recorder (PSR) logs provided by some affected users to better understand the full extent of the impact, which will help us attempt to reproduce the issue.
• We’re reaching out to some affected users to request Fiddler trace logs so that we can identify the root cause of the impact.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Next update by : Tuesday, June 28, 2022, 6:00 PM (9:00 AM UTC)

June 24, 2022 9:55 AM – Service restored

• ・Title : Users can’t create new subfolders within public folders in any Outlook app
• ・User Impact : Users are unable to create new subfolders within public folders in any Outlook app.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : We’re continuing to analyze available diagnostic data to try to isolate and reproduce the issue.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Next update by : Friday, June 24, 2022, 12:00 PM (3:00 AM UTC)

June 24, 2022 8:37 AM – Service restored

• ・Title : Users can’t create new subfolders within public folders in any Outlook app
• ・User Impact : Users are unable to create new subfolders within public folders in any Outlook app.
• ・More info : Affected users see the following error message : “Cannot create the folder.”
• ・Current status : We’re analyzing error details and available diagnostic data to determine the source of the issue.
• ・Scope of impact : This issue impacts some users attempting to create new subfolders within public folders.
• ・Next update by : Friday, June 24, 2022, 10:00 AM (1:00 AM UTC)

June 24, 2022 8:09 AM – Service restored

• ・Title : Users can’t create new subfolders within public folders in any Outlook app
• ・User Impact : Users are unable to create new subfolders within public folders in any Outlook app.
• ・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 : This issue impacts some users attempting to create new subfolders within public folders.

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