{"id":15003,"date":"2026-02-19T03:01:10","date_gmt":"2026-02-18T18:01:10","guid":{"rendered":"https:\/\/m365jp.net\/?p=15003"},"modified":"2026-02-19T03:02:07","modified_gmt":"2026-02-18T18:02:07","slug":"servicedegradation-cw1226324-microsoft-365-copilot-chat-users-email-messages-with-a-confidential-label-applied-are-being-incorrectly-processed-by-microsoft-365-copilot-chat-5","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-19-servicedegradation-cw1226324-microsoft-365-copilot-chat-users-email-messages-with-a-confidential-label-applied-are-being-incorrectly-processed-by-microsoft-365-copilot-chat-5","title":{"rendered":"[serviceDegradation] CW1226324 | Microsoft 365 Copilot Chat | Users’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat"},"content":{"rendered":"
\n
\n
\n\n\n\n
CW1226324 | Microsoft 365 Copilot Chat | Users’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/18\/2026 17:12:22<\/td>\n<\/tr>\n
Start Time<\/th>\n01\/21\/2026 07:25:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat<\/p>\n

User impact: Users’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat.<\/p>\n

More info: The Microsoft 365 Copilot “work tab” Chat is summarizing email messages even though these email messages have a sensitivity label applied and a DLP policy is configured.<\/p>\n

Current status: We’re continuing to monitor the final stages of our fix deployment as it saturates throughout the remaining affected infrastructure. Once this saturation is complete, we’ll reach out to your representatives to conduct additional testing with a subset of affected users and verify impact has been remediated as expected.<\/p>\n

Scope of impact: Your organization is affected by this event, and users’ email messages with a confidential label applied are being incorrectly processed by Microsoft 365 Copilot chat. This section may be updated as our investigation continues.<\/p>\n

Start time: Wednesday, January 21, 2026, at 7:25 AM UTC<\/p>\n

Root cause: A code issue is allowing items in the sent items and draft folders to be picked up by Copilot even though confidential labels are set in place.<\/p>\n

Next update by: Thursday, February 19, 2026, at 9:30 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u6a5f\u5bc6\u30e9\u30d9\u30eb\u304c\u9069\u7528\u3055\u308c\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u304cMicrosoft 365 Copilot\u30c1\u30e3\u30c3\u30c8\u3067\u8aa4\u3063\u3066\u51e6\u7406\u3055\u308c\u3066\u3044\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u6a5f\u5bc6\u30e9\u30d9\u30eb\u304c\u9069\u7528\u3055\u308c\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u304cMicrosoft 365 Copilot\u30c1\u30e3\u30c3\u30c8\u3067\u8aa4\u3063\u3066\u51e6\u7406\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:Microsoft 365 Copilot\u306e\u300c\u4ed5\u4e8b\u30bf\u30d6\u300d\u30c1\u30e3\u30c3\u30c8\u306f\u3001\u30bb\u30f3\u30b7\u30c6\u30a3\u30d6\u30e9\u30d9\u30eb\u304c\u9069\u7528\u3055\u308cDLP\u30dd\u30ea\u30b7\u30fc\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8981\u7d04\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u73fe\u72b6:\u6b8b\u308b\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30a4\u30f3\u30d5\u30e9\u5168\u4f53\u306b\u4fee\u6b63\u304c\u6d78\u900f\u3057\u3064\u3064\u3042\u308b\u4e2d\u3001\u6700\u7d42\u6bb5\u968e\u3092\u5f15\u304d\u7d9a\u304d\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u98fd\u548c\u72b6\u614b\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u4e00\u90e8\u3092\u5bfe\u8c61\u306b\u3001\u5f71\u97ff\u304c\u6b63\u5e38\u306b\u6539\u5584\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u62c5\u5f53\u8005\u306b\u9023\u7d61\u3057\u307e\u3059\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u8cb4\u7d44\u7e54\u306f\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u5f71\u97ff\u3092\u53d7\u3051\u3066\u304a\u308a\u3001\u6a5f\u5bc6\u30e9\u30d9\u30eb\u304c\u4ed8\u3051\u3089\u308c\u305f\u30e6\u30fc\u30b6\u30fc\u306e\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u304cMicrosoft 365 Copilot\u30c1\u30e3\u30c3\u30c8\u3067\u8aa4\u3063\u3066\u51e6\u7406\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u8abf\u67fb\u304c\u9032\u3080\u306b\u3064\u308c\u3066\u66f4\u65b0\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e741\u670821\u65e5\u6c34\u66dc\u65e5 7:25 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:\u30b3\u30fc\u30c9\u306e\u554f\u984c\u3068\u3057\u3066\u3001\u9001\u4fe1\u6e08\u307f\u306e\u30a2\u30a4\u30c6\u30e0\u3084\u30c9\u30e9\u30d5\u30c8\u30d5\u30a9\u30eb\u30c0\u30fc\u5185\u306e\u30a2\u30a4\u30c6\u30e0\u304c\u3001\u6a5f\u5bc6\u30e9\u30d9\u30eb\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305aCopilot\u304c\u5f15\u304d\u53d6\u308a\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u6b21\u56de\u66f4\u65b0:2026\u5e742\u670819\u65e5\u6728\u66dc\u65e5 \u5348\u524d9\u664230\u5206 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

CW1226324 | Microsoft 365 Copilot Chat | Users’ email messages with a confidential label applied are bei […]<\/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-15003","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15003","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=15003"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15003\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}