{"id":17923,"date":"2026-08-18T16:01:11","date_gmt":"2026-08-18T07:01:11","guid":{"rendered":"https:\/\/m365jp.net\/?p=17923"},"modified":"2026-08-18T16:12:35","modified_gmt":"2026-08-18T07:12:35","slug":"servicedegradation-ex1456866-exchange-online-some-users-may-be-unable-to-send-or-receive-new-exchange-online-email-through-the-native-ios-mail-app-3","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-08-18-servicedegradation-ex1456866-exchange-online-some-users-may-be-unable-to-send-or-receive-new-exchange-online-email-through-the-native-ios-mail-app-3","title":{"rendered":"[serviceDegradation] EX1456866 | Exchange Online | Some users may be unable to send or receive new Exchange Online email through the native iOS mail app"},"content":{"rendered":"
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EX1456866 | Exchange Online | Some users may be unable to send or receive new Exchange Online email through the native iOS mail app<\/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>\nincident<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to send or receive new Exchange Online email through the native iOS mail app.<\/td>\n<\/tr>\n
Last Updated<\/th>\n08\/18\/2026 06:48:28<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/18\/2026 03:25:40<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users may be unable to send or receive new Exchange Online email through the native iOS mail app <\/p>\n

User impact: Users may be unable to send or receive new Exchange Online email through the native iOS mail app. <\/p>\n

Current status: After reviewing the logs, we identified that there were recent changes to an authentication component utilized for Exchange ActiveSync that is causing connection failures. We’re working to revert the problematic changes, which we anticipate should remediate the impact by the time of our next scheduled update, at which point we’ll reach out to confirm with a subset of impacted users. <\/p>\n

Scope of impact: Some users attempting to send or receive new Exchange Online email through the native iOS mail app are impacted. <\/p>\n

Start time: Monday, August 17, 2026, at 11:38 PM UTC <\/p>\n

Root cause: Recent changes to an authentication component utilized for Exchange ActiveSync are causing connection failures. <\/p>\n

Next update by: Tuesday, August 18, 2026, at 9:00 AM UTC<\/td>\n<\/tr>\n

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EX1456866 | Exchange Online | Some users may be unable to send or receive new Exchange Online email through 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-17923","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17923","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=17923"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17923\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=17923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=17923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=17923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}