【トラブルシューティング】オンプレミスユーザーが多要素認証（MFA）を利用している場合に Microsoft 365 サービスにアクセスできないことがある問題【MO287933】【復旧済み】

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Microsoft が提供する Microsoft 365 のサービス正常性（MO287933）にて、多要素認証（MFA）を利用しているオンプレミスユーザーが、Microsoft 365 サービスにアクセスできないことがある問題が発生していました。

この問題は、基盤となっているインフラストラクチャーのスケールアップ作業を行うことで解決しているとのことです。

なお、この問題はオンプレミスの多要素認証（MFA）または、Network Policy Server（NPS）に接続しているユーザーに特に影響する問題となっています。

根本的な原因の特定については引き続き調査が行われているとのことです。

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サービス：Microsoft 365 suite

状態：Post-incident report published

ユーザーへの影響：On-premises users who utilize MFA have been unable to access Microsoft 365 services.

Microsoft 365 のサービス正常性（MO287933）にて、多要素認証（MFA）を利用しているオンプレミスユーザーが、Microsoft 365 サービスにアクセスできないことがある問題が発生していました。

この問題は、基盤となっているインフラストラクチャーのスケールアップ作業を行うことで解決しているとのことです。

なお、この問題はオンプレミスの多要素認証（MFA）または、Network Policy Server（NPS）に接続しているユーザーに特に影響する問題となっています。

根本的な原因の特定については引き続き調査が行われているとのことです。

A post-incident report has been published.

・Title : On-premises users who utilize Multi-Factor Authentication (MFA) may be unable to access Microsoft 365 services
・User Impact : On-premises users who utilize MFA have been unable to access Microsoft 365 services.
・Final status : We performed scale up activities on the underlying infrastructure to mitigate the issue.
We’ve also confirmed with impacted customers that the issue is now resolved for them.
・Scope of impact : This issue specifically impacted customers who use on-premises Multi-Factor Authentication (MFA) servers to connect to Active Directory Federation Services (ADFS) or Network Policy Server (NPS).
Cloud Authentication was not impacted.
・Start time : Tuesday, September 28, 2021, 10:15 PM (1:15 PM UTC)
・End Time : Wednesday, September 29, 2021, 2:20 AM (9/28/2021, 5:20 PM UTC)
Preliminary Root Cause : Work continues to fully identify the underlying root cause and will be published as a part of the Post Incident Report.
A post-incident report will be provided for this issue within 5 days.

・Title : On-premises users who utilize Multi-Factor Authentication (MFA) may be unable to access Microsoft 365 services
・User Impact : On-premises users who utilize MFA may be unable to access Microsoft 365 services.
・Current status : We’ve performed scale up activities on the underlying infrastructure and we’ve received confirmation from some previously impacted users that the issue is now resolved for them.
We also are seeing the service returning to a healthy state.
In parallel, we continue to investigate the underlying root cause so further actions can be taken to ensure the issue does not reoccur.
Engineering remains engaged to ensure that the service remains in a healthy state.
・Scope of impact : This issue specifically impacts customers who use on-premises Multi-Factor Authentication (MFA) servers to connect to Active Directory Federation Services (ADFS) or Network Policy Server (NPS). Cloud Authentication is not impacted.
・Start time: Tuesday, September 28, 2021, 10:15 PM (1:15 PM UTC)
・Next update by: Wednesday, September 29, 2021, 4:00 AM (9/28/2021, 7:00 PM UTC)

・Title : On-premises users who utilize Multi-Factor Authentication (MFA) may be unable to access Microsoft 365 services
・User Impact : On-premises users who utilize MFA may be unable to access Microsoft 365 services.
・Current status : We’re performing multiple recovery work streams to provide relief.
In parallel, we’re continuing to investigate the source of the 503 errors on the underlying infrastructure and reviewing recent changes as a potential root cause.
・Scope of impact : This issue specifically impacts customers who use on-premises Multi-Factor Authentication (MFA) servers to connect to Active Directory Federation Services (ADFS) or Network Policy Server (NPS). Cloud Authentication is not impacted.
・Start time: Tuesday, September 28, 2021, 10:15 PM (1:15 PM UTC)
・Next update by : Wednesday, September 29, 2021, 3:00 AM (9/28/2021, 6:00 PM UTC)

・Title : Issues with Multi-Factor Authentication (MFA) for on-premises users
・User Impact : On-premises users may be unable to access Microsoft 365 services due to being unable to log in through MFA.
・Current status : We’ve identified 503 errors from specific processing components and we’re reviewing these errors to identify the source.
・Scope of impact : This issue could potentially affect any user if they leverage MFA and either Network Policy Server (NPS) or Active Directory Federation Services (ADFS) to access Microsoft 365 services.
This issue only affect on-premises users, and cloud hosted users are not affected.
・Start time: Tuesday, September 28, 2021, 10:15 PM (1:15 PM UTC)
・Next update by : Wednesday, September 29, 2021, 1:30 AM (9/28/2021, 4:30 PM UTC)

・Title : Issues with Multi-Factor Authentication (MFA)
・User Impact: Users may be unable to access Microsoft 365 services due to being unable to log in through MFA.
・Current status : We’re investigating a potential issue with Multi-Factor Authentication and checking for impact to your organization.
We’ll provide an update within 30 minutes.