{"id":15734,"date":"2026-04-03T03:01:32","date_gmt":"2026-04-02T18:01:32","guid":{"rendered":"https:\/\/m365jp.net\/?p=15734"},"modified":"2026-04-03T03:04:22","modified_gmt":"2026-04-02T18:04:22","slug":"servicerestored-dz1261545-microsoft-defender-xdr-admins-may-see-delayed-or-missing-new-attack-simulation-training-ast-campaign-training-notifications-in-defender","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-03-servicerestored-dz1261545-microsoft-defender-xdr-admins-may-see-delayed-or-missing-new-attack-simulation-training-ast-campaign-training-notifications-in-defender","title":{"rendered":"[serviceRestored] DZ1261545 | Microsoft Defender XDR | Admins may see delayed or missing new Attack Simulation Training (AST) campaign training notifications in Defender"},"content":{"rendered":"
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DZ1261545 | Microsoft Defender XDR | Admins may see delayed or missing new Attack Simulation Training (AST) campaign training notifications in Defender<\/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>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nAdmins may have seen delayed or missing new AST campaign training notifications in Microsoft Defender for Office 365.<\/td>\n<\/tr>\n
Last Updated<\/th>\n04\/02\/2026 17:13:53<\/td>\n<\/tr>\n
Start Time<\/th>\n03\/18\/2026 00:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n04\/02\/2026 08:40:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Admins may see delayed or missing new Attack Simulation Training (AST) campaign training notifications in Defender<\/p>\n

User impact: Admins may have seen delayed or missing new AST campaign training notifications in Microsoft Defender for Office 365.<\/p>\n

More info: Admins reviewing the affected training campaigns saw the following message which stated, “This training campaign is in a scheduled state, please visit this page once the campaign has moved to an inprogress state.”<\/p>\n

Final status: Following the deployment of our fix, our internal service telemetry has validated that the isolated code regression has been addressed and that the impact has been remediated. <\/p>\n

Scope of impact: This incident impacted some admins, who may have seen delayed or missing training notifications for new AST campaigns in Microsoft Defender for Office 365. <\/p>\n

Start time: Wednesday, March 18, 2026, at 12:00 AM UTC<\/p>\n

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

Root cause: A recent service update to Microsoft Defender introduced a code regression that resulted in impact.<\/p>\n

Next steps:
– We’re further analyzing the isolated code regression and the service update that introduced it so we can improve our pre-deployment testing and validation processes and to prevent similar issues 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:\u7ba1\u7406\u8005\u306fDefender\u3067\u65b0\u3057\u3044\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u8a13\u7df4(AST)\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u8a13\u7df4\u901a\u77e5\u304c\u9045\u308c\u305f\u308a\u6b20\u843d\u3057\u3066\u3044\u308b\u306e\u3092\u76ee\u306b\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u7ba1\u7406\u8005\u306fMicrosoft Defender for Office 365\u3067\u65b0\u3057\u3044AST\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u901a\u77e5\u306e\u9045\u5ef6\u3084\u6b20\u843d\u3092\u76ee\u306b\u3057\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8a73\u7d30\u60c5\u5831:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u3092\u78ba\u8a8d\u3057\u305f\u7ba1\u7406\u8005\u306f\u3001\u300c\u3053\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u306f\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u72b6\u614b\u306b\u3042\u308a\u307e\u3059\u3002\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u304c\u9032\u884c\u4e2d\u306e\u72b6\u614b\u306b\u79fb\u884c\u3057\u305f\u3089\u3001\u3053\u306e\u30da\u30fc\u30b8\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u300d\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u4fee\u6b63\u306e\u5c0e\u5165\u5f8c\u3001\u793e\u5185\u30b5\u30fc\u30d3\u30b9\u30c6\u30ec\u30e1\u30c8\u30ea\u306b\u3088\u308a\u3001\u5b64\u7acb\u3057\u305f\u30b3\u30fc\u30c9\u56de\u5e30\u304c\u89e3\u6c7a\u3055\u308c\u3001\u5f71\u97ff\u304c\u662f\u6b63\u3055\u308c\u305f\u3053\u3068\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u3053\u306e\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u306f\u4e00\u90e8\u306e\u7ba1\u7406\u8005\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u3001Microsoft Defender for Office 365\u306e\u65b0\u3057\u3044AST\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u901a\u77e5\u304c\u9045\u308c\u305f\u308a\u6b20\u843d\u3057\u305f\u308a\u3057\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e743\u670818\u65e5\u6c34\u66dc\u65e5 0:00 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e744\u67082\u65e5\u6728\u66dc\u65e5 \u5348\u524d8\u664240\u5206 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:Microsoft Defender\u306e\u6700\u8fd1\u306e\u30b5\u30fc\u30d3\u30b9\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u30b3\u30fc\u30c9\u306e\u56de\u5e30\u304c\u767a\u751f\u3057\u3001\u5f71\u97ff\u304c\u751f\u3058\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u5206\u96e2\u3055\u308c\u305f\u30b3\u30fc\u30c9\u306e\u56de\u5e30\u3068\u305d\u308c\u3092\u3082\u305f\u3089\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u3055\u3089\u306b\u5206\u6790\u3057\u3001\u4e8b\u524d\u306e\u30c6\u30b9\u30c8\u3068\u691c\u8a3c\u30d7\u30ed\u30bb\u30b9\u3092\u6539\u5584\u3057\u3001\u5c06\u6765\u7684\u306a\u540c\u69d8\u306e\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306b\u9032\u3081\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":"

DZ1261545 | Microsoft Defender XDR | Admins may see delayed or missing new Attack Simulation Training (AST) ca […]<\/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-15734","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15734","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=15734"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15734\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}