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Microsoft が提供する Microsoft 365 のサービス正常性（EX421831）にて、macOS のユーザーが Outlook for Mac デスクトップクライアントで PW（パスワード）の入力が繰り返し求められる可能性があるアドバイザリが発行されていました。

なお、本事象は主にトルコ語が影響を受けていたことが確認されていますが、英語以外の言語にも影響があった可能性があります。

※ 英語を利用している場合、本事象の影響は受けていません。

そのため、一時的に主要言語を英語に設定するか、Outlook on the web を利用することでな回避策することができました。

現在は、最新バージョンの Outlook for Mac がリリースされたことにより、社内およびユーザーテストで、本事象が解決していることを確認しています。

今後は、影響が発生した URL 言語変換コードの検証を継続し、根本的な原因の把握と同様の事象の問題の防止に努めるとのことです。

この問題は、トルコ語または英語以外の言語を主要言語として設定している Outlook for Mac のデスクトップクライアントにアクセスしようとした macOS ユーザーが影響を受ける事象になります。

・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may have been repeatedly asked for their password in the Outlook for Mac desktop client.
・More info: As a result of impact, users may have been unable to access their mailbox. While most reports of the issue indicated that Turkish was the predominantly impacted language, the problem could have also impacted other languages outside of English.
Please note that English was unaffected by this event.
Users could have bypassed the impact while we addressed this issue by setting English as the primary language.
We’ve also received reports that users may have been able to use Outlook on the web as a temporary workaround.
・Final status : The new app has been released and we’ve confirmed via internal and user testing that the updated version of the Outlook for Mac desktop client has remediated this issue.
We’ve additionally received reports that users may be able to use Outlook on the web as a temporary workaround.
・Scope of impact : Any macOS user that attempted to access the Outlook for Mac desktop client with Turkish or another non-English language selected as the primary language was impacted.
・Start time : Sunday, August 28, 2022, 8:02 PM (11:02 AM UTC)
・End time : Tuesday, September 13, 2022, 10:00 PM (1:00 PM UTC)
・Root cause: A language settings code pathway problem associated with URL language translation was interrupting the authentication process for Outlook for Mac when Turkish and potentially other non-English languages were set as the primary language, resulting in impact.
・Next steps : – We’re continuing our review of the URL language translation code that resulted in impact to better understand the underlying cause and prevent similar issues in the future.
This is the final update for this event.

September 7, 2022 4:36 AM – Service restored

・・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may be repeatedly asked for their password in the Outlook for Mac desktop client.
・More info : As a result of impact, users may be unable to access their mailbox.
While most reports of the issue indicate that Turkish is the predominantly impacted language, the problem could also impact other languages outside of English.
Please note that English is unaffected by this event.
Users can bypass the impact while we address this issue by setting English as the primary language.
We’ve also received reports that users may be able to use Outlook on the web as a temporary workaround.
・Current status : While our investigation into the service environment to isolate the root cause of the impact continues, we’ve identified a potential method to expedite remediation by restructuring the language settings code pathway.
We’re validating the fix for efficacy before initiating deployment, and we anticipate that the fix will be fully deployed by Tuesday, September 13, 2022, after which we’ll test to ensure impact is remediated.
・Scope of impact : Any macOS user attempting to access the Outlook for Mac desktop client with Turkish selected as the primary language is impacted.
・Estimated time to resolve : We anticipate that the fix will be fully deployed and impact remediated by Wednesday, September 14, 2022, 5:30 AM (9/13/2022, 8:30 PM UTC).
・Root cause : A language settings code pathway problem associated with URL language translation is interrupting the authentication process for Outlook for Mac when Turkish and potentially other non-English languages are set as the primary language, resulting in impact.
・Next update by : Wednesday, September 14, 2022, 5:30 AM (9/13/2022, 8:30 PM UTC)

August 31, 2022 3:57 AM – Service restored

・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may be repeatedly asked for their password in the Outlook for Mac desktop client.
・More info : As a result of impact, users may be unable to access their mailbox. The problem occurs when Turkish is selected as the primary language.
Where possible, users can bypass the impact while we address this issue by setting a language other than Turkish as the primary language.
We’ve additionally received reports that users may be able to use Outlook on the web as a temporary workaround.
・Current status : Due to the complexity of this issue, we’re continuing to conduct an end-to-end review of the language settings code pathway to determine the source of the error and validate an optimal solution.
・Scope of impact : Any macOS user attempting to access the Outlook for Mac desktop client with Turkish selected as the primary language is impacted.
・Next update by : Wednesday, September 7, 2022, 5:30 AM (9/6/2022, 8:30 PM UTC)

August 30, 2022 4:28 AM – Service restored

・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may be repeatedly asked for their password in the Outlook for Mac desktop client.
・More info : As a result of impact, users may be unable to access their mailbox.
The problem occurs when Turkish is selected as the primary language.
Where possible, users can bypass the impact while we address this issue by setting a language other than Turkish as the primary language.
We’ve additionally received reports that users may be able to use Outlook on the web as a temporary workaround.
・Current status : Our investigation so far has determined that an error is occurring in the authorization code pathway required for some language settings, resulting in impact when Turkish is set to the primary language.
We’re conducting an end-to-end review of the language settings code pathway to determine the root cause of the error and formulate a strategy for remediation.
・Scope of impact : Any macOS user attempting to access the Outlook for Mac desktop client with Turkish selected as the primary language may be impacted.
・Next update by : Wednesday, August 31, 2022, 5:30 AM (8/30/2022, 8:30 PM UTC)

August 30, 2022 1:29 AM – Service restored

・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may be repeatedly asked for their password in the Outlook for Mac desktop client.
・More info : As a result of impact, users may be unable to access their mailbox.
We’ve received reports that users may be able to use Outlook on the web as a temporary workaround.
・Current status : We’ve so far been unable to identify a service outage based on a review of service telemetry and any recent code changes that could inflict this problem.
We’re requesting additional client logs from users that can actively reproduce the problem, which will help our investigation.
Users can collect this information by navigating to app and selecting Help, followed by Collect Diagnostics.
Please provide this information within your existing support case for us to review.
・Scope of impact : Any macOS user attempting to access the Outlook for Mac desktop client with Turkish selected as the primary language may be impacted.
・Next update by : Tuesday, August 30, 2022, 11:00 PM (2:00 PM UTC)

August 29, 2022 11:34 PM – Service restored

・Title : MacOS users may encounter a repeated password prompt in the Outlook for Mac desktop client
・User Impact : Users may be repeatedly asked for their password in the Outlook for Mac desktop client.
・More info : As a result of impact, users may be unable to access their mailbox.
We’ve received reports that users may be able to use Outlook on the web as a temporary workaround.
・Current status : We’re reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan.
・Scope of impact : Any macOS user attempting to access the Outlook for Mac desktop client with Turkish selected as the primary language may be impacted.
・Next update by : Tuesday, August 30, 2022, 1:30 AM (8/29/2022, 4:30 PM UTC)

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