{"id":15759,"date":"2026-04-03T11:00:56","date_gmt":"2026-04-03T02:00:56","guid":{"rendered":"https:\/\/m365jp.net\/?p=15759"},"modified":"2026-04-03T11:01:50","modified_gmt":"2026-04-03T02:01:50","slug":"servicerestored-mo1268972-microsoft-365-suite-some-users-may-be-unable-to-access-the-microsoft-365-web-sign-in-page-and-the-microsoft-365-copilot-web-sign-in-page","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-03-servicerestored-mo1268972-microsoft-365-suite-some-users-may-be-unable-to-access-the-microsoft-365-web-sign-in-page-and-the-microsoft-365-copilot-web-sign-in-page","title":{"rendered":"[serviceRestored] MO1268972 | Microsoft 365 suite | Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page"},"content":{"rendered":"
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MO1268972 | Microsoft 365 suite | Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may have been unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page.<\/td>\n<\/tr>\n
Last Updated<\/th>\n04\/03\/2026 01:49:19<\/td>\n<\/tr>\n
Start Time<\/th>\n04\/02\/2026 20:40:00<\/td>\n<\/tr>\n
End Time<\/th>\n04\/03\/2026 00:55:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page<\/p>\n

User impact: Users may have been unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page.<\/p>\n

More info: Users couldn’t access Microsoft Copilot through application-based Microsoft Copilot services. This included, but was not limited to:
– Microsoft Copilot desktop app
– Copilot in Microsoft Teams
– Copilot in Office apps
Users may have been able to leverage m365.cloud.microsoft\/search<\/a>, and should been able to sign in using this page. Once signed in, users could access Office.com.<\/p>\n

Final status: We monitored our telemetry after implementing our configuration changes and confirmed that the impact was remediated.<\/p>\n

Scope of impact: Impact was specific to users who were attempting to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign\u2011in page.<\/p>\n

Start time: Thursday, April 2, 2026, at 8:40 PM UTC<\/p>\n

End time: Friday, April 3, 2026, at 12:55 AM UTC<\/p>\n

Root cause: The infrastructure that supports access to Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign-in page was not processing traffic efficiently, which prevented some users from accessing the service pages.<\/p>\n

Next steps:
– We’re reviewing performance data and trends on the affected infrastructure to help develop improved preventative measures to avoid similar impact in the future.<\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306fMicrosoft 365\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u304a\u3088\u3073Microsoft 365 Copilot\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306fMicrosoft 365\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u304a\u3088\u3073Microsoft 365 Copilot\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u30e6\u30fc\u30b6\u30fc\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30d9\u30fc\u30b9\u306eMicrosoft Copilot\u30b5\u30fc\u30d3\u30b9\u3092\u901a\u3058\u3066Microsoft Copilot\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3053\u308c\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\u304c\u3001\u3053\u308c\u306b\u9650\u5b9a\u3055\u308c\u307e\u305b\u3093:
– Microsoft Copilot\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u30a2\u30d7\u30ea
– Microsoft Teams\u306eCopilot
– Office\u30a2\u30d7\u30ea\u306eCopilot
\u30e6\u30fc\u30b6\u30fc\u306f m365.cloud.microsoft\/search<\/a> \u3092\u6d3b\u7528\u3067\u304d\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u3053\u306e\u30da\u30fc\u30b8\u304b\u3089\u30b5\u30a4\u30f3\u30a4\u30f3\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002\u30b5\u30a4\u30f3\u30a4\u30f3\u3059\u308c\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u306f Office.com \u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u8a2d\u5b9a\u5909\u66f4\u5f8c\u306e\u30c6\u30ec\u30e1\u30c8\u30ea\u3092\u76e3\u8996\u3057\u3001\u5f71\u97ff\u304c\u6539\u5584\u3055\u308c\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u5f71\u97ff\u306fMicrosoft 365\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u304a\u3088\u3073Microsoft 365 Copilot\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u7279\u5316\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e744\u67082\u65e5\u6728\u66dc\u65e5 20:40 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e744\u67083\u65e5\u91d1\u66dc\u65e5 0:55 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:Microsoft 365\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u304a\u3088\u3073Microsoft 365 Copilot\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30f3\u30a4\u30f3\u30da\u30fc\u30b8\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30a4\u30f3\u30d5\u30e9\u304c\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u52b9\u7387\u7684\u306b\u51e6\u7406\u3057\u3066\u304a\u3089\u305a\u3001\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u30b5\u30fc\u30d3\u30b9\u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u304f\u306a\u3063\u305f\u3053\u3068\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u5f71\u97ff\u3092\u53d7\u3051\u305f\u30a4\u30f3\u30d5\u30e9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c7\u30fc\u30bf\u3068\u52d5\u5411\u3092\u898b\u76f4\u3057\u3001\u5c06\u6765\u540c\u69d8\u306e\u5f71\u97ff\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u4e88\u9632\u7b56\u3092\u7b56\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u304c\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

MO1268972 | Microsoft 365 suite | Some users may be unable to access the Microsoft 365 web sign-in page and th […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15759","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=15759"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15759\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15759"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}