{"id":18950,"date":"2026-10-14T05:06:29","date_gmt":"2026-10-13T20:06:29","guid":{"rendered":"https:\/\/m365jp.net\/?p=18950"},"modified":"2026-10-14T05:08:32","modified_gmt":"2026-10-13T20:08:32","slug":"servicedegradation-ex1479349-exchange-online-users-may-be-unable-to-reply-or-reply-all-to-email-messages-sent-to-microsoft-365-groups-in-exchange-online-7","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-10-14-servicedegradation-ex1479349-exchange-online-users-may-be-unable-to-reply-or-reply-all-to-email-messages-sent-to-microsoft-365-groups-in-exchange-online-7","title":{"rendered":"[serviceDegradation] EX1479349 | Exchange Online | Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online"},"content":{"rendered":"
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EX1479349 | Exchange Online | Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online<\/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 may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online.<\/td>\n<\/tr>\n
Last Updated<\/th>\n10\/13\/2026 19:17:13<\/td>\n<\/tr>\n
Start Time<\/th>\n09\/25\/2026 15:52:36<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online <\/p>\n

User impact: Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. <\/p>\n

More info: As a temporary alternative, impacted users may reply or reply all to email messages through user inboxes. <\/p>\n

Current status: Our monitoring of the deployment is ongoing as it propagates through earlier deployment rings prior to beginning saturation to affected customers\u2019 environments. We’ll provide a projected timeline for remediation based on the rate of progress as one becomes available. <\/p>\n

Scope of impact: This issue impacts any user attempting to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. This information may be updated as our investigation continues. <\/p>\n

Start time: Tuesday, September 8, 2026, at 11:00 PM UTC <\/p>\n

Root cause: A recent change made to the service removed an attribute component from the service process that requires that attribute, leading to impact. <\/p>\n

Next update by: Wednesday, October 14, 2026, at 8:30 PM UTC<\/td>\n<\/tr>\n

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