{"id":15579,"date":"2026-03-26T06:01:07","date_gmt":"2026-03-25T21:01:07","guid":{"rendered":"https:\/\/m365jp.net\/?p=15579"},"modified":"2026-03-26T06:01:22","modified_gmt":"2026-03-25T21:01:22","slug":"servicedegradation-dz1261545-microsoft-defender-xdr-admins-may-see-delayed-or-missing-training-notifications-for-new-attack-simulation-training-ast-campaigns-in-defender","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-26-servicedegradation-dz1261545-microsoft-defender-xdr-admins-may-see-delayed-or-missing-training-notifications-for-new-attack-simulation-training-ast-campaigns-in-defender","title":{"rendered":"[serviceDegradation] DZ1261545 | Microsoft Defender XDR | Admins may see delayed or missing training notifications for new Attack Simulation Training (AST) campaigns in Defender"},"content":{"rendered":"
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DZ1261545 | Microsoft Defender XDR | Admins may see delayed or missing training notifications for new Attack Simulation Training (AST) campaigns in Defender<\/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>\nAdmins may see delayed or missing training notifications for new AST campaigns in Microsoft Defender for Office 365.<\/td>\n<\/tr>\n
Last Updated<\/th>\n03\/25\/2026 20:21:23<\/td>\n<\/tr>\n
Start Time<\/th>\n03\/18\/2026 00:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Admins may see delayed or missing training notifications for new Attack Simulation Training (AST) campaigns in Defender<\/p>\n

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

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

Current status: We’ve received reports from a subset of affected admins who are reporting delayed or missing training notifications for newly created AST campaigns in Microsoft Defender for Office 365. We’ve isolated a recent service update to Microsoft Defender which introduced a code regression, resulting in impact. We’ve created a code fix to address the regression, and we aim to provide a timeline for fix deployment in our next scheduled update.<\/p>\n

Scope of impact: This incident impacts some admins, who may see delayed or missing training notifications for new AST campaigns in Microsoft Defender for Office 365. This section may be updated as the investigation progresses.<\/p>\n

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

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

Next update by: Thursday, March 26, 2026, at 12:00 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u7ba1\u7406\u8005\u306fDefender\u306e\u65b0\u3057\u3044\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0(AST)\u30ad\u30e3\u30f3\u30da\u30fc\u30f3\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u901a\u77e5\u304c\u9045\u5ef6\u307e\u305f\u306f\u4e0d\u5728\u306b\u8868\u793a\u3055\u308c\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\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\u3059\u308b\u3053\u3068\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\u3066\u3044\u308b\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\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u73fe\u72b6:Microsoft Defender for Office 365\u3067\u65b0\u305f\u306b\u4f5c\u6210\u3055\u308c\u305fAST\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\u3066\u3044\u308b\u3068\u3044\u3046\u5831\u544a\u3092\u53d7\u3051\u53d6\u308a\u307e\u3057\u305f\u3002\u6700\u8fd1\u306eMicrosoft Defender\u306e\u30b5\u30fc\u30d3\u30b9\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u30b3\u30fc\u30c9\u56de\u5e30\u304c\u5c0e\u5165\u3055\u308c\u3001\u5f71\u97ff\u304c\u751f\u3058\u305f\u3053\u3068\u3092\u7279\u5b9a\u3057\u307e\u3057\u305f\u3002\u56de\u5e30\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u4fee\u6b63\u3092\u4f5c\u6210\u3057\u3001\u6b21\u56de\u306e\u4e88\u5b9a\u66f4\u65b0\u3067\u4fee\u6b63\u5c55\u958b\u306e\u30bf\u30a4\u30e0\u30e9\u30a4\u30f3\u3092\u516c\u958b\u3059\u308b\u3053\u3068\u3092\u76ee\u6307\u3057\u3066\u3044\u307e\u3059\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\u53ca\u307c\u3057\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\u629c\u3051\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u8abf\u67fb\u306e\u9032\u5c55\u306b\u4f34\u3044\u66f4\u65b0\u3055\u308c\u308b\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

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

\u6b21\u56de\u66f4\u65b0:2026\u5e743\u670826\u65e5\u6728\u66dc\u65e5 0:00 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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